[r2004-07-04 22:08:18 by vbenzake] Empty log message

Original author: vbenzake
Date: 2004-07-04 22:08:18+00:00

web/tutorial/queries.xml

@@ -245,19 +245,17 @@ Ok.
 thus duplicates are not eliminated. To discard them, one has to use the <code>distinct_values</code> operator.
 </p>
 
+
 <p>
 <b> A pure pattern example </b></p>
 <p>
-This example computes the same result as the previous query. It is written in a pure pattern form (i.e., without any XPath-like projections)
+This example computes the same result as the previous query except that duplicates are eliminated. It is written in a pure pattern form (i.e., without any XPath-like projections)
 </p>
 
 <sample><![CDATA[
 let sel = select t
 from <_>[(x::<paper>_ | _ )*] in [bib],
-     (<_>[(a::<author>_ | _)*] & <_>[(t::<title>_ | _)*]) in x,
-      (<author>"Alain Frisch" | <author>"Veronique Benzaken") in a
-     
-      
+     <_>[ _* (<author>"Alain Frisch" | <author>"Veronique Benzaken")  _*  (t&<title>_ ); _]  in x  
 
 ]]>
 </sample>
@@ -265,12 +263,9 @@ from <_>[(x::<paper>_ | _ )*] in [bib],
 Result:
 </p>
 <sample><![CDATA[
-
-val sel : [ [ <title>[ Char* ] ]* ] = [ [ <title>[ 'Semantic subtyping' ] ]
-  [ <title>[ 'Semantic subtyping' ] ]
-  [ <title>[ 'The Relevance of Semantic Subtyping' ] ]
-  [ <title>[ 'CDuce: a white-paper' ] ]
-  [ <title>[ 'CDuce: a white-paper' ] ]
+val sel : [ <title>[ Char* ]* ] = [ <title>[ 'Semantic subtyping' ]
+  <title>[ 'The Relevance of Semantic Subtyping' ]
+  <title>[ 'CDuce: a white-paper' ]
   ]
 
 Ok.