attempting conditional select items using itemsets (http://goo.gl/Z6QQO)

sample_form.xml

<?xml version="1.0" encoding="UTF-8" ?>
<h:html xmlns:h="http://www.w3.org/1999/xhtml" xmlns:orx="http://openrosa.org/jr/xforms" xmlns="http://www.w3.org/2002/xforms" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:jr="http://openrosa.org/javarosa">
	<h:head>
		<h:title>location location location</h:title>
		<model>
			<instance>
				<data xmlns:jrm="http://dev.commcarehq.org/jr/xforms" xmlns="http://openrosa.org/formdesigner/4DCD3A18-692B-4BA4-BC5A-A863D1C766FA" uiVersion="1" version="1" name="location location location">
					<name />
					<province />
					<district />
				</data>
			</instance>
			<instance id="provinces" src="jr://fixture/item-list:province"></instance>
			<instance id="districts" src="jr://fixture/item-list:district"></instance>
			<bind nodeset="/data/name" type="xsd:string" />
			<bind nodeset="/data/province" />
			<bind nodeset="/data/district" />
			<itext>
				<translation lang="en" default="">
					<text id="name-label">
						<value>name</value>
					</text>
					<text id="province-label">
						<value>Province</value>
					</text>
					<text id="district-label">
						<value>District</value>
					</text>
				</translation>
			</itext>
		</model>
	</h:head>
	<h:body>
		<input ref="/data/name">
			<label ref="jr:itext('name-label')" />
		</input>
		<select1 ref="/data/province">
			<label ref="jr:itext('province-label')" />
			<itemset nodeset="instance('provinces')/province_list/province">
                             <label ref="name"></label>
                             <value ref="id"></value>
                        </itemset>
		</select1>
		<select1 ref="/data/district">
			<label ref="jr:itext('district-label')" />
			<itemset nodeset="instance('districts')/district_list/district[province_id = /data/province]">
                             <label ref="name"></label>
                             <value ref="id"></value>
                        </itemset>
		</select1>
	</h:body>
</h:html>