新手上路，不明白这段代码为什么不能显示运行，各位大侠帮我看看，不要见笑阿。
<?xml version="1.0" encoding="UTF-8"?>
- <!-- $Rev: 939 $ $Date: 2006-04-11 10:49:22 +0200 (Tue, 11 Apr 2006) $ $Author: giurca $
-->
- <!-- This example file is based on the Version 0.1 of R2ML
-->
- <r2ml:RuleBase xmlns:r2ml="http://oxygen.de/R2ML/0.1/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://oxygen.informatik.tu-cottbus.de/R2ML/0.1/ http://oxygen.de/R2ML/0.1/R2ML.xsd">
- <r2ml:DerivationRuleSet>
- <!-- Prolog derivation rule 1
-->
- <r2ml:DerivationRule r2ml:id="DR001">
- <r2ml:Documentation>
<r2ml:RuleText r2ml:textFormat="plain">If X is the parent of Y and X is brother of Z then Z is the uncle of Y</r2ml:RuleText>
- <r2ml:SourceCode r2ml:language="Prolog">
- <![CDATA[ uncle(Z,Y):-parent(X,Y),brother(X,Z) .
]]>
</r2ml:SourceCode>
<dc:subject>Uncle definition</dc:subject>
<dc:creator>A G</dc:creator>
<dc:contributor>G W</dc:contributor>
<dc:contributor>S L</dc:contributor>
<dc:title>Uncle Rule</dc:title>
<dc:description>REWERSE I1 Rules Markup Language</dc:description>
<dc:date>2006-04-06</dc:date>
</r2ml:Documentation>
- <r2ml:conditions>
- <r2ml:GenericAtom r2ml:predicateID="parent">
- <r2ml:arguments>
<r2ml:Variable r2ml:name="X" />
<r2ml:Variable r2ml:name="Y" />
</r2ml:arguments>
</r2ml:GenericAtom>
- <r2ml:GenericAtom r2ml:predicateID="brother">
- <r2ml:arguments>
<r2ml:Variable r2ml:name="X" />
<r2ml:Variable r2ml:name="Z" />
</r2ml:arguments>
</r2ml:GenericAtom>
</r2ml:conditions>
- <r2ml:conclusion>
- <r2ml:GenericAtom r2ml:predicateID="uncle">
- <r2ml:arguments>
<r2ml:Variable r2ml:name="Z" />
<r2ml:Variable r2ml:name="Y" />
</r2ml:arguments>
</r2ml:GenericAtom>
</r2ml:conclusion>
</r2ml:DerivationRule>
- <!--
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2006/4/20 5:39:00
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请教各位高手帮我看看这段代码
