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1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
2 <html>
3 <head>
4   <title>MathQL</title>
5                                                        
6   <meta http-equiv="content-type"
7  content="text/html; charset=ISO-8859-1">
8                                
9   <meta name="author" content="Ferruccio Guidi">
10                                
11   <meta name="description" content="MathQL Home Page">
12 </head>
13   <body>
14               
15 <h1 align="center">MathQL-1</h1>
16            
17 <h2 align="center">A query language for RDF metadata</h2>
18                
19 <table cellpadding="10" cellspacing="2" border="0" width="95%"
20  bgcolor="#ffffff">
21           <tbody>
22             <tr>
23               <td valign="top" align="left">                            
24                            
25       <ul>
26                 <li><a href="index.html">Forward</a><br>
27              </li>
28                                                                
29       </ul>
30                                                
31       <ul>
32               <li>Features</li>
33                                                
34       </ul>
35                                                
36       <ul>
37               <li><a href="whatsnew.html">What's new</a></li>
38        
39       </ul>
40        
41       <ul>
42          <li><a href="documentation.html">Documentation</a></li>
43                                                                
44       </ul>
45                                        
46       <ul>
47              <li><a href="implementation.html">Implementation</a><br>
48              </li>
49                                        
50       </ul>
51                                        
52       <ul>
53              <li><a href="authors.html">The authors</a><br>
54              </li>
55                                                                
56       </ul>
57                                        
58       <ul>
59              <li><a href="links.html">Links</a><br>
60              </li>
61                                        
62       </ul>
63            <br>
64               </td>
65               <td valign="top">                                   
66       <div align="right"><b>Goals &nbsp;and features</b><br>
67            </div>
68            <br>
69      MathQL-1 is designed to achieve the following goals:<br>
70                
71       <ol>
72           <li>Exploitation of <a href="http://www.w3.org/RDF/">RDF</a> technology
73  to manage metadata and <b>compliance with the main requirements</b> for
74 an  RDF query language. In particular:</li>
75                
76       </ol>
77                
78       <blockquote>                  
79         <ul>
80             <li>MathQL-1 provides facilities for hierarchical constraints 
81 based on <a href="http://www.w3.org/TR/rdf-schema/">RDF Schema</a> and for 
82 traversal of compound values of properties.</li>
83                    
84         </ul>
85                    
86         <ul>
87             <li>MathQL-1 provides a full set of Boolean operators to compose
88  the query constraints and facilities for selecting URI's or literals by
89 means  of regular expressions.</li>
90                    
91         </ul>
92                    
93         <ul>
94             <li>MathQL-1 allows to customize the query results specifying 
95 what part of a solution should be preserved or discarded.</li>
96                    
97         </ul>
98                    
99         <ul>
100             <li>MathQL-1 has a well-conceived semantics defined in term of
101  an abstract metadata model, imposes that queries return exhaustive solutions
102  and includes a "select-from-where"-like construction.</li>
103                    
104         </ul>
105                    
106         <ul>
107             <li>MathQL-1 supports a machine-processable <a
108  href="http://www.w3.org/XML/">XML</a> syntax as well as a human-readable
109  textual syntax to achieve the best usability.<br>
110             </li>
111                    
112         </ul>
113         </blockquote>
114                
115       <ol start="2">
116           <li>Careful <b>treatment of query results</b> that are as important
117  as the queries themselves. In particular:<br>
118           </li>
119                
120       </ol>
121                
122       <blockquote>                  
123         <ul>
124             <li>MathQL-1 query results have a 4-dimensional geometry whereas
125  other languages assume that query results are returned in 1-dimensional
126 structures  (ie lists of resources) or 2-dimensional structures (ie relational
127 database  tables). This allows to get better outcomes from queries returning
128 structured  results.<br>
129             </li>
130                    
131         </ul>
132                    
133         <ul>
134             <li>Besides the syntax for queries, MathQL-1 provides a syntax
135  for query results with its own rigorously defined semantics.<br>
136             </li>
137                    
138         </ul>
139         </blockquote>
140                
141       <ol start="3">
142           <li>Exploitation of <b>constructions borrowed from programming
143 languages</b>  to allow sophisticated queries that need computation over
144 the queried data.  In particular:<br>
145           </li>
146                
147       </ol>
148                
149       <blockquote>                  
150         <ul>
151             <li>MathQL-1 supports variables for storing intermediate query
152  results, provides iterators over these results, has a conditional operator
153  and includes logging facilities for debugging purposes.</li>
154                    
155         </ul>
156         </blockquote>
157         </td>
158       </tr>
159        
160   </tbody>  
161 </table>
162   <br>
163   <br>
164  <br>
165 </body>
166 </html>