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XML schema

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Im a newbie to XML. I have used XML schema for imposing restrictions. My question is if I have a base schema, is there any way to extend this schema to put in more constraints for your XML document. Also, another question.
Lets say, I have a document
<condition>sender is Tommy</condition>
<action>delete message</action>
I have used a schema to restrict( for this example, lets say) which events are allowed, which conditions are allowed etc. But, I did not use the schema for doing a semantic check, like, whether a certain combination of event, condition and action can work or cannot work for my scenario.
Is there a way (Im sure there is. As I mentioned, Im a newbie)to have your schema do a semantic check ?
Don't get me started about those stupid light bulbs.
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