[xwiki-devs] Macro requiring js/css

I have a java macro that requires the page to include an external js (e.g. jQuery) that works best if included in the head section of the document. Is there a way for a macro to trigger inclusion of resources like this to be included in the page header? In confluence this was done by having a #requireResource statement in a velocity template included by the macro. How can this be done in xwiki? -- Glenn