Loads definitions of rules from a XML file.
XML Format
<rules>
<rule>
<!-- required fields -->
<key>the-rule-key</key>
<name>The purpose of the rule</name>
<!-- optional fields -->
<description>
<![CDATA[The description]]>
</description>
<internalKey>Checker/TreeWalker/LocalVariableName</internalKey>
<severity>BLOCKER</severity>
<cardinality>MULTIPLE</cardinality>
<status>BETA</status>
<param>
<key>the-param-key</key>
<tag>style</tag>
<tag>security</tag>
<description>
<![CDATA[the param-description]]>
</description>
<defaultValue>42</defaultValue>
</param>
<param>
<key>another-param</key>
</param>
<!-- deprecated fields -->
<configKey>Checker/TreeWalker/LocalVariableName</configKey>
<priority>BLOCKER</priority>
</rule>
</rules>