Merging data (two xml documents, two context nodes)

I'm creating an application to build up a data.xml file, where the interface
is created via XSLT by combining the structure of a config.xml with the
values contained in the data.xml being created.  The interface is the
output.  For example:

data.xml
<page name="foo" type="A"></page>
	the name and type attributes are populated via the interface created
from config.xml

config.xml
<page>
	<attributes>
	<attribute attname="name" widget="text"/>
	<attribute attname="type" widget="select">
		<option value="PR">Press Release</option>
		<option value="A">Article</option>
	</attribute>
	</attributes>
</page>


So, while parsing the data.xml in interface.xsl I have the following
template:

<xsl:template match="page">
	Page Options:
	<xsl:call-template name="makeAttributes">
	<xsl:with-param name="prefix">page</xsl:with-param>
	</xsl:call-template>
</xsl:template>

Template "makeAttributes" then reads the config file to create the
interface:

<xsl:template name="makeAttributes">
<xsl:param name="prefix"/>
	<xsl:for-each
select="document('config.xml')/page/attributes/attribute">
		<xsl:if test="@widget='text'">
			<input type="text" name="{$prefix}|{@attname}"
value="{??? value "foo" from data.xml/page/@name ???}" />
		</xsl:if>
		<xsl:if test="@widget='select'">
			<select name="{$prefix}|{@attname}">
			<xsl:for-each select="option">
				<option value="{@value}">
				<xsl:if test="@value=??? value "A" from
data.xml/page/@type ???">
					<xsl:attribute
name="selected">selected</xsl:attribute>
				</xsl:if>
				<xsl:value-of select="."/></option>
			</xsl:for-each>
			</select>
		</xsl:if>		
	</xsl:for-each>
</xsl:template>

So the problem here is how to read data from the original context node
(data.xml/page) after the called template has changed its context to
congfig.xml/page/attributes/attribute?

I think (hope) i'm just missing something simple...
Suddenly i'm wondering if i should be parsing config.xml as the base
document, and modifying it according to the contents of data.xml, instead if
the other way around.

Thanks for any comments,
Marty
 

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