Major Description
This allows to specify a map of additional parameters used for an extension. Most usually this results in query parameters in the URL.
For example:
$xwiki.jsx.use('My.JSExtension', {'param1' : 'value', 'param2' : ['list', 'of', 'values']})
$xwiki.linkx.use($doc.getURL('view', 'xpage=doap'), {'rel': 'meta', 'type': 'application/rdf+xml', 'title': 'DOAP'}),