Javascript XPath Demo

Using XQJ API with Cocoon3

As my research pointed out XMLDB was a bit painfull to use as most xmldb implementations had quite specific API's to accomplish the same result. I instead turned my focus to the newer XQJ API which offers a JDBC alike approach to using XQuery.

Today I wrote a first draft version of an XQJGenerator accompanied from 2 basic unit tests. Although you have to be carefull that not all XQueries can be ported from XMLDB API to XQJ i managed to get the results extracted the way I wanted to.

XQJGenerator.java


XQJGeneratorTest.java


xquery1.xquery


demoboards1.xquery


test-application-context.xml


xquery1.xquery output


demoboards1.xquery output

Comparing usage of XMLDB Services

As I want to be able to use all XMLDB API services from within Cocoon a first task is comparing in what aspect usage differs accross 'Service' and 'XMLDB'.

Any good observer can see that it's possible to abstract this a bit further:

Using XpathQueryService with BaseX:




Using XQueryService with Sedna:

Function that checks if 2 collections intersect (xslt2.0)

XPath does offer a intersect operator but that operator checks only on 2 node sets. I needed to check if a nodeset(status as xs:string) intersected with a predefined sequence of statuses ('RFS', 'DOD', 'WIT', 'OBS').

I ended up writing some generic function:



The way I can call this function now is: