Here is a CER rule set which includes another:
<?xml version="1.0" encoding="UTF-8"?>
<RuleSet name="Example_Include"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation=
"http://www.curamsoftware.com/CreoleRulesSchema.xsd">
<!-- This rule class is defined directly in this rule set -->
<Class name="Person">
<Attribute name="firstName">
<type>
<javaclass name="String"/>
</type>
<derivation>
<specified/>
</derivation>
</Attribute>
</Class>
<!-- Include a rule set defined in another file.
When assembled into a single rule set, the
names of all the rule classes must be unique. -->
<Include>
<RelativePath value="./HelloWorld.xml"/>
</Include>
</RuleSet>
And here is the same rule set after consolidation:
<?xml version="1.0" encoding="UTF-8"?><RuleSet
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
name="Example_Include" xsi:noNamespaceSchemaLocation=
"http://www.curamsoftware.com/CreoleRulesSchema.xsd">
<!-- This rule class is defined directly in this rule set -->
<Class name="Person">
<Attribute name="firstName">
<type>
<javaclass name="String"/>
</type>
<derivation>
<specified/>
</derivation>
</Attribute>
</Class>
<!-- Include a rule set defined in another file.
When assembled into a single rule set, the
names of all the rule classes must be unique. -->
<!--Start inclusion of ./HelloWorld.xml-->
<Class name="HelloWorld">
<Attribute name="greeting">
<type>
<javaclass name="String"/>
</type>
<derivation>
<String value="Hello, world!"/>
</derivation>
</Attribute>
</Class>
<!--End inclusion of ./HelloWorld.xml-->
</RuleSet>