This is an extension to rdfQuery to glean DC-HTML metadata from a document. It's quick, it's dirty, it probably doesn't work properly.

jquery.dc-html.js

(function ($) {
  var ns = {}, parsedNS = false;
	
	parseNS = function() {
		parsedNS = true;
		var l =$('link[rel^=schema\.]');
		if(l && l[0])
		{
			l.each(function() { 
				var uri;
				if((uri = $(this).attr('href')))
				{
					var prefix = $(this).attr('rel').substring(7);
					ns[prefix] = uri;
				}
			});
		}
	}
	
	gleaner = function(options)
	{	
		var triples = [], triple, m, p = new RegExp(/^([^\.]+)\.(.*)/), context = context || {}, parent;
		if(!parsedNS) parseNS();
		parent = context.subject || $.rdf.resource('<>');
		m = $(this).find('meta[name*=\.]');
		if(m && m[0])
		{
			m.each(function() {
				var prefix = '', name = p.exec($(this).attr('name')), content = $(this).attr('content');
				if(name.length != 3) continue;
				prefix = name[1];
				if(!content || prefix == 'schema') return;
				name = name[2];
				if(typeof ns[prefix] == 'undefined')
				{
					console.log('skipping <meta> with undefined prefix ' + prefix);
					return;
				}
				triple = $.rdf.triple(parent, $.rdf.resource($.uri(ns[prefix] + name)), $.rdf.literal(content, { datatype: 'http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral' }), { source: this[0] });
				triples = triples.concat(triple);
			});
		}
		m = $(this).find('*[rel*=\.]');
		if(m && m[0])
		{
			m.each(function() {
				var prefix = '', name = p.exec($(this).attr('rel')), content = $(this).attr('href');
				if(name.length != 3) continue;
				prefix = name[1];
				if(!content || prefix == 'schema') return;
				name = name[2];
				if(typeof ns[prefix] == 'undefined')
				{
					console.log('skipping <* rel="..."> with undefined prefix ' + prefix);
					return;
				}
				triple = $.rdf.triple(parent, $.rdf.resource($.uri(ns[prefix] + name)), $.rdf.literal(content, { datatype: 'http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral' }), { source: this[0] });
				triples = triples.concat(triple);
			});
		}
		return triples;
	}
	
	$.rdf.gleaners.push(gleaner);
})(jQuery);