<html>
<head>
<title>MathQL</title>
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<meta http-equiv="content-type"
content="text/html; charset=ISO-8859-1">
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<meta name="author" content="Ferruccio Guidi">
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<meta name="description" content="MathQL Home Page">
</head>
<body>
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<h1 align="center">MathQL-1</h1>
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<h2 align="center">A query language for RDF metadata</h2>
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<table cellpadding="10" cellspacing="2" border="0" width="95%"
bgcolor="#ffffff">
- <tbody>
- <tr>
- <td valign="top" align="left">
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+ <tbody>
+ <tr>
+ <td valign="top" align="left">
+
<ul>
- <li><a href="index.html">Forward</a><br>
- </li>
-
-
+
<li><a href="index.html">Forward</a><br>
+ </li>
+
+
</ul>
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+
<ul>
- <li><a href="features.html">Features</a></li>
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+
<li><a href="features.html">Features</a></li>
+
</ul>
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+
<ul>
- <li>What's new<br>
- </li>
-
+ <li>What's new<br>
+ </li>
+
</ul>
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+
<ul>
- <li><a href="documentation.html">Documentation</a></li>
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+
<li><a href="documentation.html">Documentation</a></li>
+
+
</ul>
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+
<ul>
- <li><a href="implementation.html">Implementation</a><br>
- </li>
-
+
<li><a href="implementation.html">Implementation</a><br>
+ </li>
+
</ul>
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+
<ul>
- <li><a href="authors.html">The authors</a><br>
- </li>
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+
<li><a href="authors.html">The authors</a><br>
+ </li>
+
+
</ul>
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+
<ul>
- <li><a href="links.html">Links</a><br>
- </li>
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+
<li><a href="links.html">Links</a><br>
+ </li>
+
</ul>
- <br>
- </td>
- <td valign="top">
-
+ <br>
+ </td>
+ <td valign="top">
+
<div align="right"><b>What's new</b><br>
- <br>
- </div>
- This page reports the newly <a href="implementation.html">implemented</a>
-features of MathQL-1 that are not included in the ufficial <a
+ <br>
+ </div>
+ This page reports the newly <a href="implementation.html">implemented</a>
+
features of MathQL-1 that are not included in the ufficial <a
href="documentation.html">documentation</a> yet.<br>
- <br>
-Changes and additions to MathQL-1 operators:<br>
+ <br>
+ Changes and additions to MathQL-1 operators:<br>
+
<ul>
- <li>The <b>add</b> operator now accepts a syntax extension allowing
+ <li>The <b>add</b> operator now accepts a syntax extension allowing
to specify more than one explicit attribute group.</li>
+
</ul>
+
<blockquote>The syntax now is:</blockquote>
- <blockquote><query> := "add" [ "distr" ]? [ <groups> |
-<avar> ] "in" <query><br>
-<groups> := <group> [ ";" <group> ]*<br>
-<group> := <attribute> [ "," <attribute> ]*<br>
-<attribute> := <value> "as" <path><br>
- <br>
-Examples:<br>
-the query <b>add "1" as "a", "2" as "b" in subj "A"</b> gives the result
+
+ <blockquote><query> := "add" [ "distr" ]? [ <groups> | <avar>
+] "in" <query><br>
+ <groups> := <group> [ ";" <group> ]*<br>
+ <group> := <attribute> [ "," <attribute> ]*<br>
+ <attribute> := <value> "as" <path><br>
+ <br>
+ Examples:<br>
+ the query <b>add "1" as "a", "2" as "b" in subj "A"</b> gives the result
<b>"A" attr {"a"="1"; "b"="2"}</b> while<br>
-the query <b>add "1" as "a"; "2" as "b" in subj "A"</b> gives the result
+ the query <b>add "1" as "a"; "2" as "b" in subj "A"</b> gives the result
<b>"A" attr {"a"="1"}, {"b"="2"}</b>.<br>
- </blockquote>
+ </blockquote>
+
<ul>
- <li>The new <b>align</b> operator takes an integer <i>i</i> (represented
-as a string), a multiple string value <i>v</i> and returns the same <i>v</i>
-where each string with length <i>n < i</i> is prefixed with <i>i - n</i>
+ <li>The new <b>align</b> operator takes an integer <i>i</i> (represented
+as a string), a multiple string value <i>v</i> and returns the same <i>v</i>
+where each string with length <i>n < i</i> is prefixed with <i>i - n</i>
spaces. The syntax of the add operator is:</li>
+
</ul>
+
<blockquote><value> := "align" <string> "in" <value><br>
- <br>
-This operators aligns strings containing numbers so that their alphabetic
+ <br>
+ This operators aligns strings containing numbers so that their alphabetic
order agrees with their numeric order.<br>
- </blockquote>
-
+ </blockquote>
+
<ul>
- <li>The <b>intersect</b> operator now intersects the attribute groups
-of the mathing subject strings set-theoretically rather than making their
-"Cartesian product". This semantics reduces the computational costs and makes
+ <li>The <b>intersect</b> operator now intersects the attribute groups
+of the mathing subject strings set-theoretically rather than making their
+"Cartesian product". This semantics reduces the computational costs and makes
intersection the dual of union.</li>
+
</ul>
+
<ul>
- <li>The <b>property</b> operator now accepts more than one <b>isfalse</b>
-clause to increase the complexity of the constraint condition used to filter
-the query results. This feature is exploited in the queries produced by the
- <a href="implementation.html">HELM query generator</a>. <br>
- </li>
+ <li>The <b>property</b> operator now accepts more than one <b>isfalse</b>
+clause to increase the complexity of the constraint condition used to filter
+the raw query results. This feature is exploited in the queries produced
+by the <a href="implementation.html">HELM query generator</a>.
+ <br>
+ </li>
+
</ul>
- </td>
- </tr>
-
- </tbody>
+ </td>
+ </tr>
+
+ </tbody>
</table>
- <br>
+ <br>
+ <br>
</body>
</html>
projects / helm.git / blobdiff