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I would love to provide the equivalent of popup Javadoc for Ant code completion. I.e. if you are writing <chmod file="foo.sh" perm=" and forget whether the 'perm' attribute takes octal numbers, "a+x" syntax, or both, invoking code completion would show you the correct section from the chmod.html page in the Ant manual, for instant reference. Unfortunately it seems that there is no popup documentation support available to GrammarQuery implementors. I think there should be. GrammarResult, for example, could have an added method like String getPopupDocumentationHtml(); which would be displayed like Javadoc is now for Java code completion. AFAIK the editor's pseudo-APIs make this possible; the support is only missing from the xml/text-edit module.