Eclipse extension point for attribute content in JSP editor (webtools)

Question

I am trying to find extension point for providing custom attribute values in JSP editors, similar to org.eclipse.jdt.ui.javaCompletionProposalComputer in JDT.

I looked at WST and JST documentation referenced at http://www.eclipse.org/webtools/documentation/, but found nothing.

Is there such extension point, or some other way to provide custom attribute values for JSP tags? (I want to provide property names for key attribute in fmt:message tag).

(This is related to my original question about generic content-assist extension point, which seem to not exist)

Answer 1

org.eclipse.wst.xml.core.modelQueryExtensions would be the right way to add the values so that they're offered by content assist and respected during validation. A completion proposal computer extension is also in the works for WTP 3.2 (part of 2010's Helios release).