What's the simplest API to use in scala to perform the following XPath queries on a document?
//s:Annotation[@type='attitude']/s:Content/s:Parameter[@role='type' and not(text())]
//s:Annotation[s:Content/s:Parameter[@role='id' and not(text())]]/@type
(s is defined as a nickname for a particular namespace)
The only documentation I can find on Scala's XML libraries has no information on performing complicated real XPath queries.
I used to like JDOM for this purpose (in Java), but since JDOM doesn't support generics, it will be painful to work with in Scala. (Other XML libraries for Java have tended to be even more painful in Java, but I admit I don't know the landscape real well.)
I think I'm going to go with lightly pimping XOM. It's a bit of a shame the XOM authors decided against exposing collections of child nodes and the like, but they had more work and less advantage to doing so in Java than in Scala. (And it is an otherwise well-designed library.)
EDIT: I wound up pimping JDOM after all, because XOM doesn't compile XPath queries ahead of time. Since most of my effort was directed towards XPath this time, I was able to come up with a good model that sidesteps most of the generics issues. It shouldn't be too hard to come up with reasonable genericized versions of the methods getChildren and getAttributes and getAdditionalNamespaces in org.jdom.Element (by pimping the library with new methods that have slightly changed names.) I don't think there's a fix for getContent, and I'm not sure about getDescendants.