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let examples = [ "q1","
type Bib = <bib>[Book*]
type Book = <book year=String>[Title  (Author+ | Editor+ ) Publisher Price ]
type Author = <author>[Last  First ]
type Editor = <editor>[Last  First  Affiliation ]
type Title  = <title>[PCDATA ]
type Last  = <last>[PCDATA]
type First  = <first>[PCDATA]
type Affiliation = <affiliation>[PCDATA]
type Publisher  = <publisher>[PCDATA]
type Price  = <price>[PCDATA];;

let doc : Bib = <bib>[
             <book year=\"1994\">[
                  <title>['TCP/IP Illustrated']
                  <author>[<last>['Stevens']
                  <first>['W.']]
                  <publisher>['Addison-Wesley']
                  <price>['65.95']
             ]
             <book year=\"1992\">[
                  <title>['Advanced Programming in the Unix environment']
                  <author>[<last>['Stevens'] <first>['W.']]
                  <publisher>['Addison-Wesley']
                  <price>['65.95']
             ]
             <book year=\"2000\">[ 
                  <title>['Data on the Web']
                  <author>[<last>['Abiteboul'] <first>['Serge']]
                  <author>[<last>['Buneman'] <first>['Peter']]
                  <author>[<last>['Suciu'] <first>['Dan']]
                  <publisher>['Morgan Kaufmann Publishers']
                  <price>['39.95']
            ]
            <book year=\"1999\">[
                  <title>['The Economics of Technology and Content for Digital TV']
                  <editor>[
                      <last>['Gerbarg'] <first>['Darcy']
                      <affiliation>['CITI']
                  ]
                  <publisher>['Kluwer Academic Publishers']
                  <price>['129.95']
             ]];;
	     
	     
	     
(*
-----------------------------Q1-----------------------------
List books published by Addison-Wesley after 1991, including their year and title.
------------------------------------------------------------

<bib>
 {
  for $b in doc(\"http://bstore1.example.com/bib.xml\")/bib/book
  where $b/publisher = \"Addison-Wesley\" and $b/@year > 1991
  return
    <book year=\"{ $b/@year }\">
     { $b/title }
    </book>
 }
</bib> 

*)
<bib>
select <book year=y>([b]/Title)
from b in [doc]/<book .. >[_* <publisher>\"Addison-Wesley\";_] , 
     y in [b]/@year 
where 1991<<int_of(y);;

<bib> 
select <book year=y> t 
from <bib>[b::Book*] in [doc], 
     <book year=y .. >[t::Title _+ <publisher>\"Addison-Wesley\";_] in b 
where 1991 << int_of(y);;

";"q2","
type Bib = <bib>[Book*]
type Book = <book year=String>[Title  (Author+ | Editor+ ) Publisher Price ]
type Author = <author>[Last  First ]
type Editor = <editor>[Last  First  Affiliation ]
type Title  = <title>[PCDATA ]
type Last  = <last>[PCDATA]
type First  = <first>[PCDATA]
type Affiliation = <affiliation>[PCDATA]
type Publisher  = <publisher>[PCDATA]
type Price  = <price>[PCDATA];;

let doc : Bib = <bib>[
             <book year=\"1994\">[
                  <title>['TCP/IP Illustrated']
                  <author>[<last>['Stevens']
                  <first>['W.']]
                  <publisher>['Addison-Wesley']
                  <price>['65.95']
             ]
             <book year=\"1992\">[
                  <title>['Advanced Programming in the Unix environment']
                  <author>[<last>['Stevens'] <first>['W.']]
                  <publisher>['Addison-Wesley']
                  <price>['65.95']
             ]
             <book year=\"2000\">[ 
                  <title>['Data on the Web']
                  <author>[<last>['Abiteboul'] <first>['Serge']]
                  <author>[<last>['Buneman'] <first>['Peter']]
                  <author>[<last>['Suciu'] <first>['Dan']]
                  <publisher>['Morgan Kaufmann Publishers']
                  <price>['39.95']
            ]
            <book year=\"1999\">[
                  <title>['The Economics of Technology and Content for Digital TV']
                  <editor>[
                      <last>['Gerbarg'] <first>['Darcy']
                      <affiliation>['CITI']
                  ]
                  <publisher>['Kluwer Academic Publishers']
                  <price>['129.95']
             ]];;
	     
	     
	     
(*
---------------------------Q2---------------------------------
Create a flat list of all the title-author pairs, with each pair enclosed in a \"result\" element.
--------------------------------------------------------------

<results>
  {
    for $b in doc(\"http://bstore1.example.com/bib.xml\")/bib/book,
        $t in $b/title,
        $a in $b/author
    return
        <result>
            { $t }    
            { $a }
        </result>
  }
</results>

*)

<results>
select <result>([b]/Title @ [a]) 
from b in [doc]/Book,
     a in [b]/Author ;;


<results>
 select <result>[t a] 
 from <bib>[b::Book+] in [doc], 
      <book ..>[t&Title la::Author+ ;_] in b,
      a in la ;;

";"q3","
type Bib = <bib>[Book*]
type Book = <book year=String>[Title  (Author+ | Editor+ ) Publisher Price ]
type Author = <author>[Last  First ]
type Editor = <editor>[Last  First  Affiliation ]
type Title  = <title>[PCDATA ]
type Last  = <last>[PCDATA]
type First  = <first>[PCDATA]
type Affiliation = <affiliation>[PCDATA]
type Publisher  = <publisher>[PCDATA]
type Price  = <price>[PCDATA];;

let doc : Bib = <bib>[
             <book year=\"1994\">[
                  <title>['TCP/IP Illustrated']
                  <author>[<last>['Stevens']
                  <first>['W.']]
                  <publisher>['Addison-Wesley']
                  <price>['65.95']
             ]
             <book year=\"1992\">[
                  <title>['Advanced Programming in the Unix environment']
                  <author>[<last>['Stevens'] <first>['W.']]
                  <publisher>['Addison-Wesley']
                  <price>['65.95']
             ]
             <book year=\"2000\">[ 
                  <title>['Data on the Web']
                  <author>[<last>['Abiteboul'] <first>['Serge']]
                  <author>[<last>['Buneman'] <first>['Peter']]
                  <author>[<last>['Suciu'] <first>['Dan']]
                  <publisher>['Morgan Kaufmann Publishers']
                  <price>['39.95']
            ]
            <book year=\"1999\">[
                  <title>['The Economics of Technology and Content for Digital TV']
                  <editor>[
                      <last>['Gerbarg'] <first>['Darcy']
                      <affiliation>['CITI']
                  ]
                  <publisher>['Kluwer Academic Publishers']
                  <price>['129.95']
             ]];;
	     
	     
(*
---------------------------Q3---------------------------------
For each book in the bibliography, list the title and authors, grouped inside a \"result\" element.
--------------------------------------------------------------
<results>
{
    for $b in doc(\"http://bstore1.example.com/bib.xml\")/bib/book
    return
        <result>
            { $b/title }
            { $b/author  }
        </result>
}
</results> 


*)

<results>
select <result> ([b]/Title @ [b]/Author )
from b in [doc]/Book;;



<results>
select <result>(t @ a)
from <bib>[b::Book*] in [doc],
     <book ..>[t::Title (a::Author+|_)* ;_] in b
;;




";"q4","
type Bib = <bib>[Book*]
type Book = <book year=String>[Title  (Author+ | Editor+ ) Publisher Price ]
type Author = <author>[Last  First ]
type Editor = <editor>[Last  First  Affiliation ]
type Title  = <title>[PCDATA ]
type Last  = <last>[PCDATA]
type First  = <first>[PCDATA]
type Affiliation = <affiliation>[PCDATA]
type Publisher  = <publisher>[PCDATA]
type Price  = <price>[PCDATA];;

let doc : Bib = <bib>[
             <book year=\"1994\">[
                  <title>['TCP/IP Illustrated']
                  <author>[<last>['Stevens']
                  <first>['W.']]
                  <publisher>['Addison-Wesley']
                  <price>['65.95']
             ]
             <book year=\"1992\">[
                  <title>['Advanced Programming in the Unix environment']
                  <author>[<last>['Stevens'] <first>['W.']]
                  <publisher>['Addison-Wesley']
                  <price>['65.95']
             ]
             <book year=\"2000\">[ 
                  <title>['Data on the Web']
                  <author>[<last>['Abiteboul'] <first>['Serge']]
                  <author>[<last>['Buneman'] <first>['Peter']]
                  <author>[<last>['Suciu'] <first>['Dan']]
                  <publisher>['Morgan Kaufmann Publishers']
                  <price>['39.95']
            ]
            <book year=\"1999\">[
                  <title>['The Economics of Technology and Content for Digital TV']
                  <editor>[
                      <last>['Gerbarg'] <first>['Darcy']
                      <affiliation>['CITI']
                  ]
                  <publisher>['Kluwer Academic Publishers']
                  <price>['129.95']
             ]];;
	     
	     
(*
--------------------------------Q4------------------------------
For each author in the bibliography, list the author`s name and the titles 
of all books by that author, grouped inside a \"result\" element.
----------------------------------------------------------------
<results>
  {
    let $a := doc(\"http://bstore1.example.com/bib/bib.xml\")//author
    for $last in distinct-values($a/last),
        $first in distinct-values($a[last=$last]/first)
    order by $last, $first
    return
        <result>
            <author>
               <last>{ $last }</last>
               <first>{ $first }</first>
            </author>
            {
                for $b in doc(\"http://bstore1.example.com/bib.xml\")/bib/book
                where some $ba in $b/author 
                      satisfies ($ba/last = $last and $ba/first=$first)
                return $b/title
            }
        </result>
  }
</results> 
*)

<results>
select <result> ([a] @
                  flatten(select [b]/Title
                  from b in [doc]/Book
                  where member(a,[b]/Author) ))
from a in distinct_values( [doc]/Book/Author );;


<results>
select <result>([a] @(select t
                     from <bib>[l::Book+] in [doc],
                          <book ..>[t&Title a2::Author+ ;_] in l
                     where member(a,a2) ))                                        
from a in distinct_values(
          select a
          from <bib>[b::Book+] in [doc],
               <book ..>[Title la::Author+ ;_ ] in b,
               a in la);;




";"q5","
type Bib = <bib>[Book*]
type Book = <book year=String>[Title  (Author+ | Editor+ ) Publisher Price ]
type Author = <author>[Last  First ]
type Editor = <editor>[Last  First  Affiliation ]
type Title  = <title>[PCDATA ]
type Last  = <last>[PCDATA]
type First  = <first>[PCDATA]
type Affiliation = <affiliation>[PCDATA]
type Publisher  = <publisher>[PCDATA]
type Price  = <price>[PCDATA];;

let doc : Bib = <bib>[
             <book year=\"1994\">[
                  <title>['TCP/IP Illustrated']
                  <author>[<last>['Stevens']
                  <first>['W.']]
                  <publisher>['Addison-Wesley']
                  <price>['65.95']
             ]
             <book year=\"1992\">[
                  <title>['Advanced Programming in the Unix environment']
                  <author>[<last>['Stevens'] <first>['W.']]
                  <publisher>['Addison-Wesley']
                  <price>['65.95']
             ]
             <book year=\"2000\">[ 
                  <title>['Data on the Web']
                  <author>[<last>['Abiteboul'] <first>['Serge']]
                  <author>[<last>['Buneman'] <first>['Peter']]
                  <author>[<last>['Suciu'] <first>['Dan']]
                  <publisher>['Morgan Kaufmann Publishers']
                  <price>['39.95']
            ]
            <book year=\"1999\">[
                  <title>['The Economics of Technology and Content for Digital TV']
                  <editor>[
                      <last>['Gerbarg'] <first>['Darcy']
                      <affiliation>['CITI']
                  ]
                  <publisher>['Kluwer Academic Publishers']
                  <price>['129.95']
             ]];;
	     
	     
(*
---------------------------Q5------------------------------------
For each book found at both bstore1.example.com and bstore2.example.com, 
list the title of the book and its price from each source.
-----------------------------------------------------------------

<books-with-prices>
  {
    for $b in doc(\"http://bstore1.example.com/bib.xml\")//book,
        $a in doc(\"http://bstore2.example.com/reviews.xml\")//entry
    where $b/title = $a/title
    return
        <book-with-prices>
            { $b/title }
            <price-bstore2>{ $a/price/text() }</price-bstore2>
            <price-bstore1>{ $b/price/text() }</price-bstore1>
        </book-with-prices>
  }
</books-with-prices>

*)



type Reviews =<reviews>[Entry*];;
type Entry = <entry> [ Title Price Review];;
(*type Title = <title>[PCDATA];;*)
(*type Price= <price>[PCDATA];;*)
type Review =<review>[PCDATA];;

let amazon=
<reviews>[
    <entry>[
        <title>['Data on the Web']
        <price>['34.95']
        <review>
               ['A very good discussion of semi-structured database
               systems and XML.']
     ]
    <entry>[
        <title>['Advanced Programming in the Unix environment']
        <price>['65.95']
        <review>
               ['A clear and detailed discussion of UNIX programming.']
     ]
    <entry>[
        <title>['TCP/IP Illustrated']
        <price>['65.95']
        <review>
               ['One of the best books on TCP/IP.']
    ]
];;

<books-with-prices>
select <book-with-price>[t1 <price-amazon>([p2]/Char) <price-bn>([p1]/Char)]
from b in [doc]/Book ,
     y in [b]/@year,
     t1 in [b]/Title,
     e in [amazon]/Entry,
     t2 in [e]/Title,
     p2 in [e]/Price,
     p1 in [b]/Price
 where t1=t2;;



<books-with-prices>
select <book-with-price>[t2 <price-amazon>p2 <price-bn>p1 ]
from <bib>[b::Book*] in [doc],
     <book year=y ..>[t1&Title _* <price>p1] in b,
     <reviews>[e::Entry*] in [amazon],
     <entry>[t2&Title <price>p2 ;_] in e
where t1=t2;;



";"q6","
type Bib = <bib>[Book*]
type Book = <book year=String>[Title  (Author+ | Editor+ ) Publisher Price ]
type Author = <author>[Last  First ]
type Editor = <editor>[Last  First  Affiliation ]
type Title  = <title>[PCDATA ]
type Last  = <last>[PCDATA]
type First  = <first>[PCDATA]
type Affiliation = <affiliation>[PCDATA]
type Publisher  = <publisher>[PCDATA]
type Price  = <price>[PCDATA];;

let doc : Bib = <bib>[
             <book year=\"1994\">[
                  <title>['TCP/IP Illustrated']
                  <author>[<last>['Stevens']
                  <first>['W.']]
                  <publisher>['Addison-Wesley']
                  <price>['65.95']
             ]
             <book year=\"1992\">[
                  <title>['Advanced Programming in the Unix environment']
                  <author>[<last>['Stevens'] <first>['W.']]
                  <publisher>['Addison-Wesley']
                  <price>['65.95']
             ]
             <book year=\"2000\">[ 
                  <title>['Data on the Web']
                  <author>[<last>['Abiteboul'] <first>['Serge']]
                  <author>[<last>['Buneman'] <first>['Peter']]
                  <author>[<last>['Suciu'] <first>['Dan']]
                  <publisher>['Morgan Kaufmann Publishers']
                  <price>['39.95']
            ]
            <book year=\"1999\">[
                  <title>['The Economics of Technology and Content for Digital TV']
                  <editor>[
                      <last>['Gerbarg'] <first>['Darcy']
                      <affiliation>['CITI']
                  ]
                  <publisher>['Kluwer Academic Publishers']
                  <price>['129.95']
             ]];;
	     
(*	     
-------------------------------Q6----------------------------------
For each book that has at least one author, list the title and first two authors, 
and an empty \"et-al\" element if the book has additional authors.
-------------------------------------------------------------------
<bib>
  {
    for $b in doc(\"http://bstore1.example.com/bib.xml\")//book
    where count($b/author) > 0
    return
        <book>
            { $b/title }
            {
                for $a in $b/author[position()<=2]  
                return $a
            }
            {
                if (count($b/author) > 2)
                 then <et-al/>
                 else ()
            }
        </book>
  }
</bib>

*)


<bib>
select <book>[t  !a  !etal]
from <bib>[b::Book*] in [doc],
     <book ..>[t&Title a::(Author Author) Author&(etal:=[<et-al>[]]) ;_] | <book ..>[t&Title (a::(Author+)) (etal:=[])  _*] in b;;

";"q8","
type Bib = <bib>[Book*]
type Book = <book year=String>[Title  (Author+ | Editor+ ) Publisher Price ]
type Author = <author>[Last  First ]
type Editor = <editor>[Last  First  Affiliation ]
type Title  = <title>[PCDATA ]
type Last  = <last>[PCDATA]
type First  = <first>[PCDATA]
type Affiliation = <affiliation>[PCDATA]
type Publisher  = <publisher>[PCDATA]
type Price  = <price>[PCDATA];;

let doc : Bib = <bib>[
             <book year=\"1994\">[
                  <title>['TCP/IP Illustrated']
                  <author>[<last>['Stevens']
                  <first>['W.']]
                  <publisher>['Addison-Wesley']
                  <price>['65.95']
             ]
             <book year=\"1992\">[
                  <title>['Advanced Programming in the Unix environment']
                  <author>[<last>['Stevens'] <first>['W.']]
                  <publisher>['Addison-Wesley']
                  <price>['65.95']
             ]
             <book year=\"2000\">[ 
                  <title>['Data on the Web']
                  <author>[<last>['Abiteboul'] <first>['Serge']]
                  <author>[<last>['Buneman'] <first>['Peter']]
                  <author>[<last>['Suciu'] <first>['Dan']]
                  <publisher>['Morgan Kaufmann Publishers']
                  <price>['39.95']
            ]
            <book year=\"1999\">[
                  <title>['The Economics of Technology and Content for Digital TV']
                  <editor>[
                      <last>['Gerbarg'] <first>['Darcy']
                      <affiliation>['CITI']
                  ]
                  <publisher>['Kluwer Academic Publishers']
                  <price>['129.95']
             ]];;
	     
(*
---------------------------------Q8-----------------------------------
Find books in which the name of some element ends with the string \"or\" 
and the same element contains the string \"Suciu\" somewhere in its content. 
For each such book, return the title and the qualifying element.
-----------------------------------------------------------------------


for $b in doc(\"http://bstore1.example.com/bib.xml\")//book
let $e := $b/*[contains(string(.), \"Suciu\") 
               and ends-with(local-name(.), \"or\")]
where exists($e)
return
    <book>
        { $b/title }
        { $e }
    </book> 

*)



<result> 
select <book>[t element ]
from <bib>[b::Book*]in [doc],
     <book ..>[t&Title elements::Any*] in b,
     <(atom)>_&element  in elements,
     [_* 'or']          in [ (string_of(atom)) ],
     <_>[_* 'Suciu' _*] in [element]//<_>[Char*];;


";"q9","(*-----------------------------Q9-------------------------------------
In the document \"books.xml\", find all section or chapter titles that 
contain the word \"XML\", regardless of the level of nesting.
--------------------------------------------------------------------
<results>
  {
    for $t in doc(\"books.xml\")//(chapter | section)/title
    where contains($t/text(), \"XML\")
    return $t
  }
</results> 
*)




type Chapter = <chapter>[Title Section*]
type Section = <section>[Title Section*]
type Title = <title>[PCDATA];;
 


let doc : Chapter= 
<chapter>[
    <title>['Data Model']
      <section>[
        <title>['Syntax For Data Model']
      ]
      <section>[
        <title>['XML']
        <section>[
            <title>['Basic Syntax']
        ]
        <section>[
            <title>['XML and Semistructured Data']
        ]
      ]
];;

select  t
from t in [doc]//Section/<title>[_* 'XML' _* ];;
";"q11","
type Bib = <bib>[Book*]
type Book = <book year=String>[Title  (Author+ | Editor+ ) Publisher Price ]
type Author = <author>[Last  First ]
type Editor = <editor>[Last  First  Affiliation ]
type Title  = <title>[PCDATA ]
type Last  = <last>[PCDATA]
type First  = <first>[PCDATA]
type Affiliation = <affiliation>[PCDATA]
type Publisher  = <publisher>[PCDATA]
type Price  = <price>[PCDATA];;

let doc : Bib = <bib>[
             <book year=\"1994\">[
                  <title>['TCP/IP Illustrated']
                  <author>[<last>['Stevens']
                  <first>['W.']]
                  <publisher>['Addison-Wesley']
                  <price>['65.95']
             ]
             <book year=\"1992\">[
                  <title>['Advanced Programming in the Unix environment']
                  <author>[<last>['Stevens'] <first>['W.']]
                  <publisher>['Addison-Wesley']
                  <price>['65.95']
             ]
             <book year=\"2000\">[ 
                  <title>['Data on the Web']
                  <author>[<last>['Abiteboul'] <first>['Serge']]
                  <author>[<last>['Buneman'] <first>['Peter']]
                  <author>[<last>['Suciu'] <first>['Dan']]
                  <publisher>['Morgan Kaufmann Publishers']
                  <price>['39.95']
            ]
            <book year=\"1999\">[
                  <title>['The Economics of Technology and Content for Digital TV']
                  <editor>[
                      <last>['Gerbarg'] <first>['Darcy']
                      <affiliation>['CITI']
                  ]
                  <publisher>['Kluwer Academic Publishers']
                  <price>['129.95']
             ]];;
	     
	     
	     
(*
--------------------------------Q11------------------------------------------
For each book with an author, return the book with its title and authors. 
For each book with an editor, return a reference with the book title and the editor`s affiliation.
-------------------------------------------------------------------------------
<bib>
{
        for $b in doc(\"http://bstore1.example.com/bib.xml\")//book[author]
        return
            <book>
                { $b/title }
                { $b/author }
            </book>
}
{
        for $b in doc(\"http://bstore1.example.com/bib.xml\")//book[editor]
        return
          <reference>
            { $b/title }
            {$b/editor/affiliation}
          </reference>
}
</bib>  

*)

<bib>((
select <book>(([b]/Title) @ ([b]/Author))
from b in [doc]/<book ..>[_ Author;_])
@
(select <reference>(([b]/Title) @ ([b]/Editor/Affiliation))
from b in [doc]/<book ..>[_ Editor;_]     
));;


<bib>((
select <book>([t] @ la)
from <bib>[b::Book+] in [doc],
     <book ..>[t&Title la::Author+ ;_] in b
)@(
select <reference>[t aff]
from <bib>[b::Book+] in [doc],
     <book ..>[t&Title _* <editor>[_* aff&Affiliation] ;_] in b));;



<bib>
select <(tag)>([t] @ [a1] @a2)
from <book ..>[t&Title ((tag:=`book)&a1&Author a2::Author* | (tag:=`reference)&a1&Editor a2::Editor*) _*] in [doc]/Book;;
		       


";"q12","type Bib = <bib>[Book*]
type Book = <book year=String>[Title  (Author+ | Editor+ ) Publisher Price ]
type Author = <author>[Last  First ]
type Editor = <editor>[Last  First  Affiliation ]
type Title  = <title>[PCDATA ]
type Last  = <last>[PCDATA]
type First  = <first>[PCDATA]
type Affiliation = <affiliation>[PCDATA]
type Publisher  = <publisher>[PCDATA]
type Price  = <price>[PCDATA];;

let doc : Bib = <bib>[
             <book year=\"1994\">[
                  <title>['TCP/IP Illustrated']
                  <author>[<last>['Stevens']
                  <first>['W.']]
                  <publisher>['Addison-Wesley']
                  <price>['65.95']
             ]
             <book year=\"1992\">[
                  <title>['Advanced Programming in the Unix environment']
                  <author>[<last>['Stevens'] <first>['W.']]
                  <publisher>['Addison-Wesley']
                  <price>['65.95']
             ]
             <book year=\"2000\">[ 
                  <title>['Data on the Web']
                  <author>[<last>['Abiteboul'] <first>['Serge']]
                  <author>[<last>['Buneman'] <first>['Peter']]
                  <author>[<last>['Suciu'] <first>['Dan']]
                  <publisher>['Morgan Kaufmann Publishers']
                  <price>['39.95']
            ]
            <book year=\"1999\">[
                  <title>['The Economics of Technology and Content for Digital TV']
                  <editor>[
                      <last>['Gerbarg'] <first>['Darcy']
                      <affiliation>['CITI']
                  ]
                  <publisher>['Kluwer Academic Publishers']
                  <price>['129.95']
             ]];;


(*
---------------------------------------------Q12----------------------------------------
Find pairs of books that have different titles but the same set of authors (possibly in a different order).
------------------------------------------------------------------------------------------

<bib>
{
    for $book1 in doc(\"http://bstore1.example.com/bib.xml\")//book,
        $book2 in doc(\"http://bstore1.example.com/bib.xml\")//book
    let $aut1 := for $a in $book1/author 
                 order by $a/last, $a/first
                 return $a
    let $aut2 := for $a in $book2/author 
                 order by $a/last, $a/first
                 return $a
    where $book1 << $book2
    and not($book1/title = $book2/title)
    and deep-equal($aut1, $aut2) 
    return
        <book-pair>
            { $book1/title }
            { $book2/title }
        </book-pair>
}
</bib> 
*)


flatten(
select   select <book-pair>[!([b1]/Title) !([b2]/Title) ]
          from a in [b2]/Author
          where (member(a,[b1]/Author))

 
from b1 in [doc]/Book,
     b2 in [doc]/Book
where not([b1]/Title = [b2]/Title)
)


(*
reste a retirer les doublons. besoin de l oprateur order pour ca.
*)






";"qatt1","type Bib = <bib>[Book*]
type Book = <book year=String>[Title  (Author+ | Editor+ ) Publisher Price ]
type Author = <author>[Last  First ]
type Editor = <editor>[Last  First  Affiliation ]
type Title  = <title>[PCDATA ]
type Last  = <last>[PCDATA]
type First  = <first>[PCDATA]
type Affiliation = <affiliation>[PCDATA]
type Publisher  = <publisher>[PCDATA]
type Price  = <price>[PCDATA];;

let doc : Bib = <bib>[
             <book year=\"1994\">[
                  <title>['TCP/IP Illustrated']
                  <author>[<last>['Stevens']
                  <first>['W.']]
                  <publisher>['Addison-Wesley']
                  <price>['65.95']
             ]
             <book year=\"1992\">[
                  <title>['Advanced Programming in the Unix environment']
                  <author>[<last>['Stevens'] <first>['W.']]
                  <publisher>['Addison-Wesley']
                  <price>['65.95']
             ]
             <book year=\"2000\">[ 
                  <title>['Data on the Web']
                  <author>[<last>['Abiteboul'] <first>['Serge']]
                  <author>[<last>['Buneman'] <first>['Peter']]
                  <author>[<last>['Suciu'] <first>['Dan']]
                  <publisher>['Morgan Kaufmann Publishers']
                  <price>['39.95']
            ]
            <book year=\"1999\">[
                  <title>['The Economics of Technology and Content for Digital TV']
                  <editor>[
                      <last>['Gerbarg'] <first>['Darcy']
                      <affiliation>['CITI']
                  ]
                  <publisher>['Kluwer Academic Publishers']
                  <price>['129.95']
             ]];;
	     


let biblio = [doc]/Book;;

<bib>
    select <book (a)> x
      from <book (a)>[ (x::(Any\Editor)|_ )* ] in biblio ;;


(*This expression returns all book in bib but removoing the editor element. If one wants to write more explicitly:
*)
    select <book (a)> x
      from <book (a)>[ (x::(Any\<editor ..>_)|_ )* ] in biblio;;

(*
Or even:
*)
    select <book (a)> x
      from <book (a)>[ (x::(<(_\`editor) ..>_)|_ )* ] in biblio ;;

";"qatt2","type Bib = <bib>[Book*]
type Book = <book year=String>[Title  (Author+ | Editor+ ) Publisher Price ]
type Author = <author>[Last  First ]
type Editor = <editor>[Last  First  Affiliation ]
type Title  = <title>[PCDATA ]
type Last  = <last>[PCDATA]
type First  = <first>[PCDATA]
type Affiliation = <affiliation>[PCDATA]
type Publisher  = <publisher>[PCDATA]
type Price  = <price>[PCDATA];;

let doc : Bib = <bib>[
             <book year=\"1994\">[
                  <title>['TCP/IP Illustrated']
                  <author>[<last>['Stevens']
                  <first>['W.']]
                  <publisher>['Addison-Wesley']
                  <price>['65.95']
             ]
             <book year=\"1992\">[
                  <title>['Advanced Programming in the Unix environment']
                  <author>[<last>['Stevens'] <first>['W.']]
                  <publisher>['Addison-Wesley']
                  <price>['65.95']
             ]
             <book year=\"2000\">[ 
                  <title>['Data on the Web']
                  <author>[<last>['Abiteboul'] <first>['Serge']]
                  <author>[<last>['Buneman'] <first>['Peter']]
                  <author>[<last>['Suciu'] <first>['Dan']]
                  <publisher>['Morgan Kaufmann Publishers']
                  <price>['39.95']
            ]
            <book year=\"1999\">[
                  <title>['The Economics of Technology and Content for Digital TV']
                  <editor>[
                      <last>['Gerbarg'] <first>['Darcy']
                      <affiliation>['CITI']
                  ]
                  <publisher>['Kluwer Academic Publishers']
                  <price>['129.95']
             ]];;
	     

(*
Back to the first one:
*)
<bib>
    select <book (a)> x
      from <(book) (a)>[ (x::(Any\Editor)|_ )* ] in biblio ;;

(*
This query takes any element in bib, tranforms it in a book element and removes sub-elements editor, but you will get a warning as capture variable book in the from is never used: we should have written <(_) (a)> instead of <(book) (a)> the from
*)
    select <(book) (a)> x
      from <(book) (a)>[ (x::(Any\Editor)|_ )* ] in biblio ;;

";"qatt3","type Bib = <bib>[Book*]
type Book = <book year=String>[Title  (Author+ | Editor+ ) Publisher Price ]
type Author = <author>[Last  First ]
type Editor = <editor>[Last  First  Affiliation ]
type Title  = <title>[PCDATA ]
type Last  = <last>[PCDATA]
type First  = <first>[PCDATA]
type Affiliation = <affiliation>[PCDATA]
type Publisher  = <publisher>[PCDATA]
type Price  = <price>[PCDATA];;

let doc : Bib = <bib>[
             <book year=\"1994\">[
                  <title>['TCP/IP Illustrated']
                  <author>[<last>['Stevens']
                  <first>['W.']]
                  <publisher>['Addison-Wesley']
                  <price>['65.95']
             ]
             <book year=\"1992\">[
                  <title>['Advanced Programming in the Unix environment']
                  <author>[<last>['Stevens'] <first>['W.']]
                  <publisher>['Addison-Wesley']
                  <price>['65.95']
             ]
             <book year=\"2000\">[ 
                  <title>['Data on the Web']
                  <author>[<last>['Abiteboul'] <first>['Serge']]
                  <author>[<last>['Buneman'] <first>['Peter']]
                  <author>[<last>['Suciu'] <first>['Dan']]
                  <publisher>['Morgan Kaufmann Publishers']
                  <price>['39.95']
            ]
            <book year=\"1999\">[
                  <title>['The Economics of Technology and Content for Digital TV']
                  <editor>[
                      <last>['Gerbarg'] <first>['Darcy']
                      <affiliation>['CITI']
                  ]
                  <publisher>['Kluwer Academic Publishers']
                  <price>['129.95']
             ]];;
	     
(*
Same thing but without tranforming tag to \"book\".
More interestingly:
*)


    select <(b) (a\id)> x
      from <(b) (a)>[ (x::(Any\Editor)|_ )* ] in biblio ;;



(*
removes all \"id\" attribute (if any) from the attributes of the element in bib.
*)


    select <(b) (a\id+{bing=a.id})> x
      from <(b) (a)>[ (x::(Any\Editor)|_ )* ] in biblio ;;



(*
Changes attribute id=x into bing=x However, one must be sure that each element in bib has an id attribute if such is not the case the expression is ill-typed. If one wants to perform this only for those elements which certainly have an id attribute then:
*)


    select <(b) (a\id+{bing=a.id})> x
      from <(b) (a&{id=_})>[ (x::(Any\Editor)|_ )* ] in biblio ;;

";"xml","(* Syntax for XML elements *)
1026 1027

type A = <a x=String y=?String>[ B* ]
1028 1029 1030 1031 1032 1033 1034 1035 1036
type B = <b>[ PCDATA A? PCDATA ]

let x : A = 
 <a x=\"Bla\" y=\"Blo\">[ 
   <b>[ 'blabla' ]
   <b>[ 
     <a x=\"Foo\">[] 'bla' 'bla' 
   ] 
 ]
1037
";"functions","(* Simple functions can be defined this way: *)
1038 1039 1040
let f1 (x : Int) : Int = x + 3
;;
f1 5
1041 1042

(* With several arguments: *)
1043 1044 1045
let f2 (x : Int, y : Int) : Int = x + y
;;
f2 (10,20)
1046

1047 1048 1049 1050 1051
(* Currified form *)
let add (x : Int) (y : Int) : Int = x + y
;;
add 10 20

1052
(* You may directly deconstruct the arguments: *)
1053 1054 1055
type A = <a href=String>String
let f3 (<a href=url>txt : A) : String = url @ \"=>\" @ txt
;;
1056 1057 1058 1059 1060 1061
f3 <a href=\"http://www.cduce.org\">\"CDuce homepage\";;

(* In general, if you want to specify several arrow types, or
   use several pattern matching branches, you have the general
   form: *)

1062
let f4 (A -> String; ['0'--'9'+] -> Int)
1063
| x & A -> f3 x
1064 1065 1066
| x -> int_of x
;;
f4 \"123\"
1067
";"mutrec","(* Adjacent type declarations are mutually recursive *)
1068 1069 1070
type T = <t>S
type S = [ (Char | T)* ]
let x : S = [ 'abc' <t>['def'] 'ghi' ]
1071

1072
(* Similarly for toplevel function definitions *)
1073

1074 1075 1076 1077
let f (x : Int) : Int = g x
let g (x : Int) : Int = 3
let a = 2
let h (x : Int) : Int = f x
1078
   (* f and g are mutually recursive, but they cannot use h *)
1079
";"sequence","(* Sequence are just defined with pairs and the atom `nil;
1080
   the following notation are equivalent: *)
1081 1082 1083
let l1 = (1,2,3,`nil)
let l2 = (1,(2,(3,`nil)))
let l3 = [ 1 2 3 ]
1084 1085

(* The [...] notation allow to specify a tail after a semi-colon : *)
1086 1087
let l4 = (10,20,l1)
let l5 = [ 10 20 ; l1 ]
1088 1089

(* Concatenation @ *)
1090
let l6 = [ 1 2 3 ] @ [ 4 5 6 ]
1091 1092

(* Inside [...], it is possible to escape a subsequence with a ! *)
1093
let l7 = [ 1 2 !l6 !l1 5 ]
1094
";"seqtypes","(* Sequence types are defined with regular expression over types *)
1095 1096 1097
type IntList = [ Int* ]
type IntStringList = [ (Int String)* ]
type IntNonEmptyList = [ Int+ ]
1098

1099
let l : IntList = [ 1 2 3 ]
1100
";"integers","(* Yes, CDuce can handle large integers! *)
1101
let facto (Int -> Int)
1102 1103 1104
 | 0 | 1 -> 1
 | n -> n * (facto (n - 1))
in
1105
facto 300
1106 1107

(* The tail-recursive way *)
1108
let facto ((Int,Int) -> Int)
1109 1110 1111
 | (x, 0 | 1) -> x
 | (x, n) -> facto (x * n, n - 1)
in
1112
facto (1,10000)
1113
";"sumtype","type Expr = 
1114 1115 1116 1117
    (`add, Expr, Expr)
  | (`mul, Expr, Expr)
  | (`sub, Expr, Expr)
  | (`div, Expr, Expr)
1118
  | Int
1119
 
1120
let eval ( Expr -> Int )  
1121 1122 1123
  | (`add,x,y) -> eval x + eval y
  | (`mul,x,y) -> eval x * eval y
  | (`sub,x,y) -> eval x - eval y
1124
  | (`div,x,y) -> (eval x) div (eval y)
1125 1126
  | n -> n 
in
1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147
eval (`add, 10, (`mul, 20, 5))
";"ovfun","type Person = FPerson | MPerson 
type FPerson = <person gender = \"F\" >[ Name Children (Tel | Email)?] 
type MPerson = <person gender=\"M\">[ Name Children (Tel | Email)?] 
type Children = <children>[Person*] 
type Name = <name>[ PCDATA ]
type Tel = <tel kind=?\"home\"|\"work\">['0'--'9'+ '-' '0'--'9'+]
type Email = <email>[PCDATA '@' PCDATA]

type Man = <man name=String>[ Sons Daughters ]
type Woman = <woman name=String>[ Sons Daughters ]
type Sons = <sons>[ Man* ]
type Daughters = <daughters>[ Woman* ]

let split (MPerson -> Man ; FPerson -> Woman)
  <person gender=g>[ <name>n <children>[(mc::MPerson | fc::FPerson)*]; _] ->
     let tag = match g with \"F\" -> `woman | \"M\" -> `man in
     let s = map mc with x -> split x in
     let d = map fc with x -> split x in
     <(tag) name=n>[ <sons>s  <daughters>d ] 
 
1148 1149

let base : Person = 
1150 1151
<person gender=\"F\">[ 
  <name>\"Themis\"
1152
  <children>[ 
1153 1154
    <person gender=\"M\">[
      <name>\"Prometheus\"
1155
      <children>[
1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166
        <person gender=\"M\">[
          <name>\"Deucalion\"
          <children>[]
        ]
      ]
      <email>\"focifero@olympus.com\"
    ] 
    <person gender=\"M\">[
      <name>\"Epimetheus\"
      <children>[]
      <tel> \"314-1592654\"
1167 1168 1169 1170
    ]
  ] 
  <tel kind=\"home\"> \"271-828182\"
]
1171 1172 1173 1174 1175 1176
in
split base
";"note","type Doc = <doc>Text
type Text = [ (Char | (Letter+ ' '* Note))* ]
type Letter = 'a'--'z' | 'A'--'Z'
type Note = <note>[ PCDATA ]
1177

1178 1179 1180
type Flow = [ (Char | <ref no=Int>[ PCDATA ])* ]
type Notes = [ <note no=Int>[ PCDATA ]* ]
type Result = <doc>[ <body>Flow <notes>Notes ]
1181

1182
let format (<doc>s : Doc) : Result = 
1183
  let (body,notes) = text (s,1) in
1184
  <doc>[ <body>body <notes>notes ]
1185

1186
let text ( (Text,Int) -> (Flow,Notes) )
1187 1188 1189 1190
 | ([ pre::Char*? (word::Letter+ ' '* <note>n); rem ], count) ->
      let (body,notes) = text (rem, count + 1) in
      (pre @ [<ref no=count>word] @ body, 
       [<note no=count>n] @ notes)
1191
 | (body,_) -> (body, [])
1192 1193 1194

let src : Doc = <doc>[ 'CDuce ' <note>\"Frisch, Castagna, Benzaken\"
		 ' is an XML ' <note>\"a W3C standard\"
1195 1196 1197 1198 1199 1200 1201 1202 1203 1204
		 '-friendly programming language.' ]
in
format src
";"biblio","type Biblio  = <bibliography>[Heading Paper*]
type Heading = <heading>[ PCDATA ]
type Paper   = <paper>[ Author+ Title Conference File ]
type Author  = <author>[ PCDATA ]
type Title   = <title>[ PCDATA ]
type Conference = <conference>[ PCDATA ]
type File    = <file>[ PCDATA ]
1205 1206

(* Simplified HTML *)
1207
type Html  = <html>[ <head>[ <title>[ PCDATA ] ]  <body>Mix ]
1208
type Mix   = [ ( <h1>Mix | <a href=String>Mix | <p>Mix | <em>Mix 
1209
	       | <ul>[ <li>Mix +] | Char )* ]
1210

1211
let do_authors ([Author+] -> Mix)
1212 1213
 | [ <author>a ] -> a
 | [ <author>a <author>b ] -> a @ \" and, \" @ b
1214
 | [ <author>a; x] -> a @ \", \" @ (do_authors x)
1215

1216
let do_paper (Paper -> <li>Mix)
1217
  <paper>[ x::_* <title>t <conference>c <file>f ] ->
1218
    <li>[ <a href=f>t !(do_authors x) '; in ' <em>c '.' ]
1219

1220
let do_biblio (Biblio -> Html)
1221 1222 1223 1224 1225
  <bibliography>[ <heading>h; p ] ->
      let body = match p with
      | [] -> \"Empty bibliography\"
      | l -> [ <h1>h <ul>(map l with x -> do_paper x) ]
      in    
1226
      <html>[ <head>[ <title>h ] <body>body ]
1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255

let bib : Biblio = 
  <bibliography>[
    <heading>\"Alain Frisch's bibliography\"
    <paper>[
      <author>\"Alain Frisch\"
      <author>\"Giuseppe Castagna\"
      <author>\"Vronique Benzaken\"
      <title>\"Semantic subtyping\"
      <conference>\"LICS 02\"
      <file>\"semsub.ps.gz\"
    ]
    <paper>[
      <author>\"Mariangiola Dezani-Ciancaglini\"
      <author>\"Alain Frisch\"
      <author>\"Elio Giovannetti\"
      <author>\"Yoko Motohama\"
      <title>\"The Relevance of Semantic Subtyping\"
      <conference>\"ITRS'02\"
      <file>\"itrs02.ps.gz\"
    ]
    <paper>[
      <author>\"Vronique Benzaken\"
      <author>\"Giuseppe Castagna\"
      <author>\"Alain Frisch\"
      <title>\"CDuce: a white-paper\"
      <conference>\"PLANX-02\"
      <file>\"planx.ps.gz\"
    ]
1256 1257 1258
 ]
in
do_biblio bib
1259
";"projection","(* The projection  e/t   is translated to:
1260 1261
   transform e with [ (x::t|_)* ]  -> x *)

1262 1263 1264 1265 1266 1267 1268
type Biblio  = <bibliography>[Heading Paper*]
type Heading = <heading>[ PCDATA ]
type Paper   = <paper>[ Author+ Title Conference File ]
type Author  = <author>[ PCDATA ]
type Title   = <title>[ PCDATA ]
type Conference = <conference>[ PCDATA ]
type File    = <file>[ PCDATA ]
1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297

let bib : Biblio = 
  <bibliography>[
    <heading>\"Alain Frisch's bibliography\"
    <paper>[
      <author>\"Alain Frisch\"
      <author>\"Giuseppe Castagna\"
      <author>\"Vronique Benzaken\"
      <title>\"Semantic subtyping\"
      <conference>\"LICS 02\"
      <file>\"semsub.ps.gz\"
    ]
    <paper>[
      <author>\"Mariangiola Dezani-Ciancaglini\"
      <author>\"Alain Frisch\"
      <author>\"Elio Giovannetti\"
      <author>\"Yoko Motohama\"
      <title>\"The Relevance of Semantic Subtyping\"
      <conference>\"ITRS'02\"
      <file>\"itrs02.ps.gz\"
    ]
    <paper>[
      <author>\"Vronique Benzaken\"
      <author>\"Giuseppe Castagna\"
      <author>\"Alain Frisch\"
      <title>\"CDuce: a white-paper\"
      <conference>\"PLANX-02\"
      <file>\"planx.ps.gz\"
    ]
1298
 ]
1299

1300 1301 1302
let titles = [bib]/<paper>_/<title>_
let authors = [bib]/<paper>_/<author>_
let titles_concat = [bib]/<paper>_/<title>_/Char
1303
";"xtransform","(* For the purpose of the example we can consider this hugely
1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328
   simplified definition of Xhtml
*)

type Flow = Char | Block | Inline  ;;
type Block = P | Heading | Lists | Blocktext | Char
type Lists = Ul
type Blocktext = Pre |  Address | Center;;
type Inline = Char | A | Fontstyle
type Fontstyle = Tt | I | B | Big | Small;;

type Xhtml = <html>[ Head Body ];;
type Head = <head>[ Title <link>[ ]];;
type Title = <title>[ PCDATA ];;
type Body = <body bgcolor=?String>[ Block* ];;

type P = <p>[ Inline* ];;
type Heading = <(`h1 | `h2 | `h3 | `h4)>[ Inline* ];;

type Ul = <ul>[Li+];;
type Li = <li>[ Flow* ];;

type Address = <address>[ Inline* ];;
type Pre = <pre>[ (PCDATA | A | Fontstyle)* ];;
type Center = <center>[ Block* ];;

1329
type A = <a ({ name = String } | { href = String })>[ (Inline)* ];;
1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344
type Tt = <tt>[ Inline* ];;
type I = <i>[ Inline* ];;
type B = <b>[ Inline* ];;
type Big = <big>[ Inline* ];;
type Small = <small>[ Inline* ];;


(* xtransform matches the patterns against the root element of each
   XML tree and, if it fails, it recursively applies itself to the
   sequence of sons of the root.

   It can be used to put in boldface all the links of an XHTML
   document as follows
*)

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let bold (x:[Xhtml]):[Xhtml] = xtransform x with <a (y)>t -> [ <a (y)>[<b>t] ]
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(* let us apply the function to a document where links appear
   at different depths
*)


let doc : Xhtml =
  <html>[
    <head>[<title>\"Example\" <link>[]]
    <body>[
      <h2>['You can have links ' <a href=\"here\">\"here\"]
      <pre>['Or they can be down']
      <ul>[
        <li>['In ' <a name=\"list\">\"lists\" ' for instance']
	<li>['or you oddly decided to ' 
             <center>[<p>[<a href=\"what?\">\"center\"]] 
             ' them '
            ]
      ]
      <address>[
        'and even if they are in fancy ' <a name=\"address\">\"address boxes\"
      ]
      <p>[
          'nevertheless ' <a href=\"http://www.cduce.org\">\"Cduce\" ' and '
          <a href=\"xtransform\">[<tt>\"xtransform\"] 
          ' will put all links in bold so that when'
          ' you program your transformation you '
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          <big>[<a name=\"\">\" don't \" ] ' have to worry about it'
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     ]
   ]
  ];;

bold [doc];;

let [x] = bold [doc] in print_xml x;;
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";"reference","(* In CDuce the expression  \"ref T exp\" returns a reference  *)
(* to the result of \"exp\" and has type \"ref T\" provided that *)
(* \"exp\" is of type \"T\". References come equipped with three *)
(* operators: \":=\" (assignment), \"!\" (dereferencing), and \";\"*) 
(* (sequencing).                                             *)


let stack = ref [Int*] []

let fun push(x : Int) : []  = 
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  stack := [x; !stack]
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let fun pop ([] : []) : Int = 
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  match !stack with [x; y] -> stack := y; x | _ -> raise \"Empty stack\"
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(* In a pattern [ ... ; y] the variable y captures the tail  *)
(* of the sequence. It is equivalent to [ ... y::_*].        *)
(* In an expression [ ... ; e ] the expression e denotes the *)
(* tail of the sequence. It is equivalent to [ ... ] @ e     *)
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;;

push 1;;
push 2;;
push 3;;
pop [];;
pop [];;
pop [];;
pop [];;
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";"pm_compil","(* This example demonstrates the efficient compilation of pattern
   matching. *)

type A = <a>[ Int* ]
type B = <b>[ Char* ]

(* Imagine we want to compile the following function:
   fun ([A+|B+] -> Bool) [A+] -> 0 | [B+] -> 1

   For an arbitrary value, it is expensive to check whether it has
   type [A+] or not. But if we know statically that it has type [A+|B+],
   we just have to check the tag of the first element !

   This is demonstrated by the following internal debugging feature.
   The syntax is:  

   debug compile T P1 ... Pn

   where T is the input type (static information about the matched
   value) and P1,...,Pn are the patterns to compile (simultaneously).

   The \"debug compile\" instruction displays an human-readable
   representation of the automaton corresponding to the pattern
   matching. Note: in actual evaluation, this automaton is build
   lazily (= on-the-fly, = JIT).
*)

debug compile [A+|B+] [A+] [B+]


(* You can see on the output that the pattern matching is actually
   compiled as:

   fun ([A+|B+] -> Int) [ <a>_ ; _ ] -> 0 | _ -> 1
*)
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"; ]
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let present = "<ul><li><a href=\"/cgi-bin/cduce?example=q1\">Q1.</a> 
Q1 Query
</li><li><a href=\"/cgi-bin/cduce?example=q2\">Q2.</a> 
Q2 Query
</li><li><a href=\"/cgi-bin/cduce?example=q3\">Q3.</a> 
Q3 Query
</li><li><a href=\"/cgi-bin/cduce?example=q4\">Q4.</a> 
Q4 Query
</li><li><a href=\"/cgi-bin/cduce?example=q5\">Q5.</a> 
Q5 Query
</li><li><a href=\"/cgi-bin/cduce?example=q6\">Q6.</a> 
Q6 Query
</li><li><a href=\"/cgi-bin/cduce?example=q8\">Q8.</a> 
Q8 Query
</li><li><a href=\"/cgi-bin/cduce?example=q9\">Q9.</a> 
Q9 Query
</li><li><a href=\"/cgi-bin/cduce?example=q11\">Q11.</a> 
Q11 Query
</li><li><a href=\"/cgi-bin/cduce?example=q12\">Q12.</a> 
Q12 Query
</li><li><a href=\"/cgi-bin/cduce?example=qatt1\">Attributs et lments.</a> 
Partie 1
</li><li><a href=\"/cgi-bin/cduce?example=qatt2\">Attributs et lments.</a> 
Partie 2
</li><li><a href=\"/cgi-bin/cduce?example=qatt3\">Attributs et lments.</a> 
Partie 3
</li><li><a href=\"/cgi-bin/cduce?example=xml\">XML elements.</a> 
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XML elements.
</li><li><a href=\"/cgi-bin/cduce?example=functions\">Functions.</a> 
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Several syntaxes to define functions.
1479
</li><li><a href=\"/cgi-bin/cduce?example=mutrec\">Mutual recursion.</a> 
1480
Mutual toplevel definition for types and functions.
1481
</li><li><a href=\"/cgi-bin/cduce?example=sequence\">Sequence literals.</a> 
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How to write sequences.
1483
</li><li><a href=\"/cgi-bin/cduce?example=seqtypes\">Sequence types.</a> 
1484
Types for sequences.
1485
</li><li><a href=\"/cgi-bin/cduce?example=integers\">The factorial function.</a> 
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What about computing 10000! ?
1487
</li><li><a href=\"/cgi-bin/cduce?example=sumtype\">Sum types.</a> 
1488
How to simulate ML sum types.
1489
</li><li><a href=\"/cgi-bin/cduce?example=ovfun\">Overloaded functions.</a> 
1490
This examples demonstrates the use of overloaded functions.
1491
</li><li><a href=\"/cgi-bin/cduce?example=note\">Footnotes.</a> 
1492
 This example shows how to bind an XML element with surrounding text.
1493
</li><li><a href=\"/cgi-bin/cduce?example=biblio\">Bibliography.</a> 
1494
The good old XML bibliography example.
1495
</li><li><a href=\"/cgi-bin/cduce?example=projection\">Projection.</a> 
1496
Syntactic sugar for projection.
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</li><li><a href=\"/cgi-bin/cduce?example=xtransform\">Tree transformations.</a> 
How to perform XSLT-like transformations.
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</li><li><a href=\"/cgi-bin/cduce?example=reference\">References.</a> 
Mutable values.
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</li><li><a href=\"/cgi-bin/cduce?example=pm_compil\">Compilation of pattern matching.</a> 
This example demonstrates the efficient compilation of pattern
matching.
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</li></ul>"