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-<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
-<html>
-<head>
- <title>MathQL</title>
-
-
- <meta http-equiv="content-type"
- content="text/html; charset=ISO-8859-1">
-
- <meta name="author" content="Ferruccio Guidi">
-
- <meta name="description" content="MathQL Home Page">
-</head>
- <body>
-
-<h1 align="center">MathQL-1</h1>
-
-<h2 align="center">A query language for RDF metadata</h2>
-
-<table cellpadding="10" cellspacing="2" border="0" width="95%"
- bgcolor="#ffffff">
- <tbody>
- <tr>
- <td valign="top" align="left">
-
- <ul>
- <li><a href="index.html">Forward</a><br>
- </li>
-
-
- </ul>
-
- <ul>
- <li><a href="features.html">Features</a></li>
-
- </ul>
-
- <ul>
- <li>What's new<br>
- </li>
-
- </ul>
-
- <ul>
- <li><a href="documentation.html">Documentation</a></li>
-
-
- </ul>
-
- <ul>
- <li><a href="implementation.html">Implementation</a><br>
- </li>
-
- </ul>
-
- <ul>
- <li><a href="authors.html">The authors</a><br>
- </li>
-
-
- </ul>
-
- <ul>
- <li><a href="links.html">Links</a><br>
- </li>
-
- </ul>
- <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
- href="documentation.html">documentation</a> yet.<br>
- <br>
- Changes and additions to MathQL-1 operators:<br>
-
- <ul>
- <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
- <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
- <b>"A" attr {"a"="1"}, {"b"="2"}</b>.<br>
- </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>
-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
-order agrees with their numeric order.<br>
- </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
-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 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>
-</table>
- <br>
- <br>
-</body>
-</html>
projects / helm.git / blobdiff