<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">
+ <tbody>
+ <tr>
+ <td valign="top" align="left">
-
+
<ul>
- <li>Forward<br>
- </li>
+ <li>Forward<br>
+ </li>
-
+
</ul>
-
+
<ul>
- <li><a href="features.html">Features</a></li>
+
<li><a href="features.html">Features</a></li>
-
+
</ul>
-
+
<ul>
- <li><a href="whatsnew.html">What's new</a></li>
-
+
<li><a href="whatsnew.html">What's new</a></li>
+
</ul>
-
+
<ul>
- <li><a href="documentation.html">Documentation</a></li>
+
<li><a href="documentation.html">Documentation</a></li>
-
+
</ul>
-
+
<ul>
- <li><a href="implementation.html">Implementation</a><br>
- </li>
+
<li><a href="implementation.html">Implementation</a><br>
+ </li>
-
+
</ul>
-
+
<ul>
- <li><a href="authors.html">The authors</a><br>
- </li>
+
<li><a href="authors.html">The authors</a><br>
+ </li>
-
+
</ul>
-
+
<ul>
- <li><a href="links.html">Links</a><br>
- </li>
+
<li><a href="links.html">Links</a><br>
+ </li>
-
+
</ul>
- <br>
- </td>
- <td valign="top">
-
+ <br>
+ </td>
+ <td valign="top">
+
<div align="right"><b>Forward</b><br>
- </div>
- <br>
- The MathQL proposal rises in the context of the <a
- href="http://helm.cs.unibo.it/">HELM project</a>, which aims at the development
-of a suitable technology for the creation and maintenance of a virtual,
-distributed, hypertextual library of structured mathematical knowledge
-based on <a href="http://www.w3.org/XML/">XML</a> technology, through the
- integration of the current proof assistants and logical frameworks with
-the most recent technologies for the development of Web applications and
-electronic publishing.<br>
- <br>
- The objective of the MathQL proposal is the development of a set
- of query languages enabling the retrieval of formalized mathematical Web
- resources on the basis of content-aware requests. The first of these
- languages, <b>MathQL-1</b>, is focused on querying an arbitrary
- <a href="http://www.w3.org/RDF/">RDF</a> database because RDF is the
- <a href="http://www.w3.org/">W3C</a> standartd for describing Web
+ </div>
+ <br>
+
The MathQL proposal rises in the context of the <a
+ href="http://helm.cs.unibo.it/">HELM project</a>, which aims at the
+development of a suitable technology for the creation and maintenance
+of a virtual, distributed, hypertextual library of structured mathematical
+ knowledge based on <a href="http://www.w3.org/XML/">XML</a> technology,
+through the integration of the current proof assistants and logical frameworks
+with the most recent technologies for the development of Web applications
+and electronic publishing.<br>
+ <br>
+ The objective of the MathQL proposal is the development of a
+set of query languages enabling the retrieval of formalized mathematical
+Web resources on the basis of content-aware requests. The first of these
+ languages, <b>MathQL-1</b>, is focused on querying an arbitrary
+ <a href="http://www.w3.org/RDF/">RDF</a> database because RDF is the
+ <a href="http://www.w3.org/">W3C</a> standartd for describing Web
resources at the general-purpose content level.<br>
- <br>
- As an RDF query language, MathQL-1 provides the main features
-required by the RDF community while complying with the needs of HELM.
-The peculiar aspects of this language concern the query results, which
-are highly structured and possess their own syntax, formally explained
-by a rigorous semantics.<br>
<br>
- MathQL-1 is particularly helpful in distributed systems where
-query engines are implemented as stand-alone units, because in this situation
- the query results are exchanged between the system components as well
- as the queries, and thus both the queries and the query results need to
-be encoded in a clearly defined format.<br>
- <br>
- Other languages to be developed in the context of the MathQL proposal
-will be suitable for queries about the semantic structure of mathematical
-data: this will include content-based pattern-matching (MathQL-2) and possibly
- other forms of formal matching involving for instance isomorphism, unification
+ As an RDF query language, MathQL-1 provides the main features
+required by the RDF community while complying with the needs of HELM.
+The peculiar aspects of this language concern the query results, which
+are highly structured and possess their own syntax, formally explained
+by a rigorous semantics.<br>
+ <br>
+ MathQL-1 is particularly helpful in distributed systems where
+ query engines are implemented as stand-alone units, because in this
+situation the query results are exchanged between the system components
+as well as the queries, and thus both the queries and the query results
+need to be encoded in a clearly defined format.<br>
+ <br>
+ Other languages to be developed in the context of the MathQL proposal
+ will be suitable for queries about the semantic structure of mathematical
+ data: this will include content-based pattern-matching (MathQL-2) and possibly
+ other forms of formal matching involving for instance isomorphism, unification
and definitions expansion (MathQL-3).<br>
- </td>
- </tr>
-
- </tbody>
+ </td>
+ </tr>
+
+ </tbody>
</table>
- <br>
- <br>
-
+ <br>
+ <br>
+
<div align="center">This site is maintained by <a
- href="mailto://fguidi@cs.unibo.it">Ferruccio Guidi</a>, last update: May
- 27, 2003.<br>
- <br>
- </div>
+ href="mailto://fguidi@cs.unibo.it">Ferruccio Guidi</a>, last update: July
+10, 2003.<br>
+ <br>
+ </div>
+ <br>
<br>
<br>
<br>
<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>
+<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">
-
+ <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>
-
+
<ul>
- <li><a href="features.html">Features</a></li>
-
+
<li><a href="features.html">Features</a></li>
+
</ul>
-
+
<ul>
- <li><a href="whatsnew.html">What's new</a></li>
-
+
<li><a href="whatsnew.html">What's new</a></li>
+
</ul>
-
+
<ul>
- <li><a href="documentation.html">Documentation</a></li>
-
+
<li><a href="documentation.html">Documentation</a></li>
+
</ul>
-
+
<ul>
- <li><a href="implementation.html">Implementation</a><br>
- </li>
-
+
<li><a href="implementation.html">Implementation</a><br>
+ </li>
+
</ul>
-
+
<ul>
- <li><a href="authors.html">The authors</a><br>
- </li>
-
+
<li><a href="authors.html">The authors</a><br>
+ </li>
+
</ul>
-
+
<ul>
- <li>Links<br>
- </li>
-
+ <li>Links<br>
+ </li>
+
</ul>
- <br>
- </td>
- <td valign="top">
+ <br>
+ </td>
+ <td valign="top">
+
<div align="right"><b>Links</b><br>
- </div>
- <br>
- <br>
- </td>
- </tr>
-
- </tbody>
+ </div>
+
+ <ul>
+ <li><a href="http://helm.cs.unibo.it/">HELM</a> Project homepage
+ <a href="http://mowgli.cs.unibo.it/">MOWGLI</a> Project homepage</li>
+ </ul>
+ <ul>
+ <li>W3C <a href="http://www.w3.org/XML/">XML</a> resources
+W3C <a href="http://www.w3c.org/RDF/">RDF</a> resources</li>
+ </ul>
+ <ul>
+ <li>Some RDF query languages having a homepage</li>
+ </ul>
+
+ <blockquote><a href="http://www.daml.org/">DAML+OIL</a> <a
+ href="http://guha.com/rdfdb/">rdfDB</a> <a
+ href="http://logicerror.com/RDFPath">RDFPath</a> <a
+ href="http://www.intellidimension.com/">RDFQL</a> <a
+ href="http://www.hpl.hp.com/semweb/rdql.htm">RDQL</a> <a
+ href="http://139.91.183.30:9090/RDF/">RQL</a> <a
+ href="http://www.dfki.uni-kl.de/ruleml/">RuleML</a> <a
+ href="http://triple.semanticweb.org/">TRIPLE</a> <a
+ href="http://swordfish.rdfweb.org/rdfquery/">SquishQL</a> <a
+ href="http://kr.cs.ait.ac.th/XDD/">XDD</a><br>
+ </blockquote>
+
+ <blockquote>Developers wishing to have their RDF query language listed
+here may contact the <a href="authors.html">authors</a>.<br>
+ </blockquote>
+ </td>
+ </tr>
+
+ </tbody>
</table>
- <small></small> <br>
- <br>
- <br>
- <br>
- <br>
- <br>
- <br>
+ <br>
</body>
</html>
<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">
-
+ <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>
-
+
<ul>
- <li><a href="features.html">Features</a></li>
-
+
<li><a href="features.html">Features</a></li>
+
</ul>
-
+
<ul>
- <li>What's new<br>
- </li>
-
+ <li>What's new<br>
+ </li>
+
</ul>
-
+
<ul>
- <li><a href="documentation.html">Documentation</a></li>
-
-
+
<li><a href="documentation.html">Documentation</a></li>
+
+
</ul>
-
+
<ul>
- <li><a href="implementation.html">Implementation</a><br>
- </li>
-
+
<li><a href="implementation.html">Implementation</a><br>
+ </li>
+
</ul>
-
+
<ul>
- <li><a href="authors.html">The authors</a><br>
- </li>
-
-
+
<li><a href="authors.html">The authors</a><br>
+ </li>
+
+
</ul>
-
+
<ul>
- <li><a href="links.html">Links</a><br>
- </li>
-
+
<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 / commitdiff