Rules for XML/XPath

[Marc Dzaebel]

Hi,

I just figure out, how to write rules for XML input. I know XSLT/XPath, CBR/ESB systems etc. but want to have complex DRL rules that are as powerfull as XSLT. It's possible to insert dom.Elements or a Proxies into working memory but there you can't specify an XPath or constrain an attribute in a DRL-pattern (at least it would be cryptic). SXC seems to be outdated so currently I'd have to program with JAXB etc. to develop my own solution.

Any helpful tools or best practices for this issue?

Thanks and best regards

Marc

[Davide Sottara]

At the moment, the use of JAXB is the most stable solution.

In the past, there was the possibility of loading an XSD as a resource: the engine would then invoke xjc implicitly. I have never used it and I don't know to what extent it still works, and how you would have to deal with the insertion of facts.
These very days I'm experimenting with Apache JXPath myself, and I'm thinking to provide a built-in way to trait XML Elements and map a virtual bean's attributes to xpath expressions, but given how hard pressed I've been recently, that feature won't be available before the end of the year.

Open to feedback, suggestions and contributions

Best
Davide

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[Marc Dzaebel]

My current ideas are:

• pass JAXB/JXPath giving up the need to have a class for every element or an XSD
  
• use Saxon-HE as it implements the newest XSLT 2.0, XQuery 3.0, and XPath 3.0 standards
  
• base rules on Wrappers that delegate to compiled XPathExpression's (NodeInfo-objects/sets as context)

I found a relevant report at http://members.inode.at/w.laun/drools/ReasoningWithXMLData/RulesXML.pdf

I'm still interested in any further, even conceptual ideas.

Good luck, Marc