1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
|
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head>
<title>Soprano.Inference.InferenceModel</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta http-equiv="Content-Style-Type" content="text/css" />
<link rel="stylesheet" type="text/css" href="../common/doxygen.css" />
<link rel="stylesheet" media="screen" type="text/css" title="KDE Colors" href="../common/kde.css" />
</head>
<body>
<div id="container">
<div id="header">
<div id="header_top">
<div>
<div>
<img alt ="" src="../common/top-kde.jpg"/>
KDE 4.9 PyKDE API Reference
</div>
</div>
</div>
<div id="header_bottom">
<div id="location">
<ul>
<li>KDE's Python API</li>
</ul>
</div>
<div id="menu">
<ul>
<li><a href="../modules.html">Overview</a></li>
<li><a href="http://techbase.kde.org/Development/Languages/Python">PyKDE Home</a></li>
<li><a href="http://kde.org/family/">Sitemap</a></li>
<li><a href="http://kde.org/contact/">Contact Us</a></li>
</ul>
</div>
</div>
</div>
<div id="body_wrapper">
<div id="body">
<div id="right">
<div class="content">
<div id="main">
<div class="clearer"> </div>
<h1>InferenceModel Class Reference</h1>
<code>from PyKDE4.soprano import *</code>
<p>
Inherits: <a href="../soprano/Soprano.FilterModel.html">Soprano.FilterModel</a> → <a href="../soprano/Soprano.Model.html">Soprano.Model</a> → QObject<br />
Namespace: <a href="../soprano/Soprano.Inference.html">Soprano.Inference</a><br />
<h2>Detailed Description</h2>
<p>\class InferenceModel inferencemodel.h Soprano/Inference/InferenceModel
</p>
<p>
The Soprano Inference Model provides a simple forward chaining inference engine
which uses the underlying parent model itself to store status information.
</p>
<p>
The InferenceModel does perfect inference which means that removing of statements is supported
and results in a perfect update of the infered statements. There is only one exception:
If a model contains two statements in different named graphs that both have the same subject,
predicate, and object and trigger one rule then if one of these statements is removed the
infered statements are removed, too, although the second statement would still make the infered
one valid. This situation gets resolved once the same rule is triggered again by some other
added statement or performInference gets called.
</p>
<p>
The inference is performed based on rules which are stored in Rule instances.
Rules can be created manually or parsed using a RuleParser.
</p>
<p>
<b>The inference engine works roughly as follows:</b>
</p>
<p>
Whenever a new statement is added it is compared to each rule to check if it could trigger this rule.
Then if it could trigger a rule this rule is applied to the whole model.
</p>
<p>
If a rule produces a new infered statement the following data is created:
<li> named graph A containing the infered statements </li>
<li> the statements that triggered the rule are stored in named graph sil:InferenceMetadata as </li>
source statements of A (sil:sourceStatement). The inference model supports two ways of storing
source statements: plain and compressed (see setCompressedSourceStatements).
</p>
<p>
Thus, when removing a statement it can easily be checked if this statement had been used to
infer another one by querying all named graphs that have this statement as a source statement.
</p>
<p>
<dl class="author" compact><dt><b>Author:</b></dt><dd> Sebastian Trueg <trueg@kde.org> </dd></dl>
</p>
<table border="0" cellpadding="0" cellspacing="0"><tr><td colspan="2"><br><h2>Methods</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#InferenceModel">__init__</a> (self, <a href="../soprano/Soprano.Model.html">Soprano.Model</a> parent)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#addRule">addRule</a> (self, <a href="../soprano/Soprano.Inference.Rule.html">Soprano.Inference.Rule</a> a0)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a href="../soprano/Soprano.Error.html#ErrorCode">Soprano.Error.ErrorCode</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#addStatement">addStatement</a> (self, <a href="../soprano/Soprano.Statement.html">Soprano.Statement</a> a0)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#clearInference">clearInference</a> (self)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#performInference">performInference</a> (self)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a href="../soprano/Soprano.Error.html#ErrorCode">Soprano.Error.ErrorCode</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#removeAllStatements">removeAllStatements</a> (self, <a href="../soprano/Soprano.Statement.html">Soprano.Statement</a> a0)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a href="../soprano/Soprano.Error.html#ErrorCode">Soprano.Error.ErrorCode</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#removeStatement">removeStatement</a> (self, <a href="../soprano/Soprano.Statement.html">Soprano.Statement</a> a0)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#setCompressedSourceStatements">setCompressedSourceStatements</a> (self, bool b)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#setOptimizedQueriesEnabled">setOptimizedQueriesEnabled</a> (self, bool b)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#setRules">setRules</a> (self, [<a href="../soprano/Soprano.Inference.Rule.html">Soprano.Inference.Rule</a>] rules)</td></tr>
</table>
<hr><h2>Method Documentation</h2><a class="anchor" name="InferenceModel"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname">__init__</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="../soprano/Soprano.Model.html">Soprano.Model</a> </td>
<td class="paramname"><em>parent</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"></div></div><a class="anchor" name="addRule"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"> addRule</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="../soprano/Soprano.Inference.Rule.html">Soprano.Inference.Rule</a> </td>
<td class="paramname"><em>a0</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>Add an inference rule to the set of rules.
This method will not trigger any inference action. If inference
is necessary call performInference() after adding the new rules.
</p></div></div><a class="anchor" name="addStatement"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"><a href="../soprano/Soprano.Error.html#ErrorCode">Soprano.Error.ErrorCode</a> addStatement</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="../soprano/Soprano.Statement.html">Soprano.Statement</a> </td>
<td class="paramname"><em>a0</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>Add a new statement to the model. Inferencing will be done directly.
Inferenced statements are stored in additional named graphs.
</p></div></div><a class="anchor" name="clearInference"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"> clearInference</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname"><em>self</em> )</td>
<td width="100%"> </td>
</tr>
</table>
</div>
<div class="memdoc"><p>Removes all statements infered by this model.
This can be useful if the parent model has been changed without informing
the inference model and statements have been removed.
</p></div></div><a class="anchor" name="performInference"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"> performInference</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname"><em>self</em> )</td>
<td width="100%"> </td>
</tr>
</table>
</div>
<div class="memdoc"><p>Normally inferencing is done once new statements are added to the model or
statements are removed. This method performs inferencing on the whole model.
It is useful for initializing a model that already contains statements or
update the model if it has been modified bypassing this filter model.
</p>
<p>
Tha latter can easily be done by connecting the Model.statementsAdded and
Model.statementsRemoved signals to this slot.
</p></div></div><a class="anchor" name="removeAllStatements"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"><a href="../soprano/Soprano.Error.html#ErrorCode">Soprano.Error.ErrorCode</a> removeAllStatements</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="../soprano/Soprano.Statement.html">Soprano.Statement</a> </td>
<td class="paramname"><em>a0</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>Remove statements from the model.
</p></div></div><a class="anchor" name="removeStatement"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"><a href="../soprano/Soprano.Error.html#ErrorCode">Soprano.Error.ErrorCode</a> removeStatement</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="../soprano/Soprano.Statement.html">Soprano.Statement</a> </td>
<td class="paramname"><em>a0</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>Remove one statement from the model.
</p></div></div><a class="anchor" name="setCompressedSourceStatements"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"> setCompressedSourceStatements</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype">bool </td>
<td class="paramname"><em>b</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>If compressed statements are enabled source statements are stored compressed
in one literal value. Otherwise source statements are stored using rdf:subject,
rdf:predicate, rdf:object, and sil:context. Non-compressed statements are much
cleaner from an ontology design point of view while compressed statements take
much less space.
</p>
<p>
By default comressed source statements are enabled.
</p>
<p>
This method exists mainly for historical reasons and there normally is no need
to call it. Compressed statements should work well for most users.
</p>
<p>
</p><dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign="top"><em>b</em> </td><td> If true compressed source statements are enabled (the default).
</td></tr>
</table></dl>
<p>
</p></div></div><a class="anchor" name="setOptimizedQueriesEnabled"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"> setOptimizedQueriesEnabled</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype">bool </td>
<td class="paramname"><em>b</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>If the storage backend supports joined SPARQL queries via UNION
it makes sense to enable this.
</p>
<p>
</p><dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign="top"><em>b</em> </td><td> If true InferenceModel will use optimized queries for
the inference during addStatement. This will speed up the
process quite a lot as matching rules are only applied to the new statement.
This flag has no influcence on performInference() though.
</td></tr>
</table></dl>
<p> The default is to disable the optimized queries since the default
soprano redland backend does not support UNION.
</p></div></div><a class="anchor" name="setRules"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"> setRules</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype">[<a href="../soprano/Soprano.Inference.Rule.html">Soprano.Inference.Rule</a>] </td>
<td class="paramname"><em>rules</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>Set the inference rules to be used.
This method will not trigger any inference action. If inference
is necessary call performInference() after adding the new rules.
</p></div></div>
</div>
</div>
</div>
<div id="left">
<div class="menu_box">
<div class="nav_list">
<ul>
<li><a href="../allclasses.html">Full Index</a></li>
</ul>
</div>
<a name="cp-menu" /><div class="menutitle"><div>
<h2 id="cp-menu-project">Modules</h2>
</div></div>
<div class="nav_list">
<ul><li><a href="../akonadi/index.html">akonadi</a></li>
<li><a href="../dnssd/index.html">dnssd</a></li>
<li><a href="../kdecore/index.html">kdecore</a></li>
<li><a href="../kdeui/index.html">kdeui</a></li>
<li><a href="../khtml/index.html">khtml</a></li>
<li><a href="../kio/index.html">kio</a></li>
<li><a href="../knewstuff/index.html">knewstuff</a></li>
<li><a href="../kparts/index.html">kparts</a></li>
<li><a href="../kutils/index.html">kutils</a></li>
<li><a href="../nepomuk/index.html">nepomuk</a></li>
<li><a href="../phonon/index.html">phonon</a></li>
<li><a href="../plasma/index.html">plasma</a></li>
<li><a href="../polkitqt/index.html">polkitqt</a></li>
<li><a href="../solid/index.html">solid</a></li>
<li><a href="../soprano/index.html">soprano</a></li>
</ul></div></div>
</div>
</div>
<div class="clearer"/>
</div>
<div id="end_body"></div>
</div>
<div id="footer"><div id="footer_text">
This documentation is maintained by <a href="mailto:simon@simonzone.com">Simon Edwards</a>.<br />
KDE<sup>®</sup> and <a href="../images/kde_gear_black.png">the K Desktop Environment<sup>®</sup> logo</a> are registered trademarks of <a href="http://ev.kde.org/" title="Homepage of the KDE non-profit Organization">KDE e.V.</a> |
<a href="http://www.kde.org/contact/impressum.php">Legal</a>
</div></div>
</body>
</html>
|
