Selecting Bits, Dumping the Rest

  Perhaps what's most obvious is hardest.  I've got some good string matches
 and position stuff going one int eh script below, but I can't get it to
 _only_ output those fields on which I am acting without naming each and
 every one of the unwanted fields.  I'm trying to strip away everything
 other than the children/contents of fields whose @tag=773 or 001.  ALl my
 stuff on 773 and 001 is working, but i'm getting tag-less output of all
 the unwanted, untemplated stuff.

 This xml:

<?xml version="1.0"?>
<marc>
<record type="naa">
<control-field tag="001">ario19990010001001</control-field>
<control-field tag="003">ATLA</control-field>
<data-field tag="100" ind1="1">
<subfield code="a">Hull, John.</subfield>
</data-field>
<data-field tag="245" ind1="1" ind2="0">
<subfield code="a">Hyde, Kenneth F, 1914-1998 :</subfield>
<subfield code="b">[obit]</subfield>
</data-field>
<data-field tag="773" ind1="0">
<subfield code="a">British Journal of Religious Education</subfield>
<subfield code="g">21 (Aut 1998), p. 5-6</subfield>
<subfield code="x">0141-6200</subfield>
</data-field>
</record>

 with this stylesheet:

<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">

<xsl:template match="/">
<xsl:apply-templates />
</xsl:template>

<xsl:template match="record" >
<xsl:element name="(value-of='*[@tag='001']')">
<xsl:value-of select="text()" />

<xsl:template match="*[@tag='773']/*[@code='x']">
<issn_x>
<xsl:value-of select="text()" />
</issn_x>
<xsl:apply-templates />
</xsl:template>

<!-- this part distinguishes the first page of the article as an "foa"
element -->

<xsl:template match="*[@tag='773']/*[@code='g']">

<citation_g>
<xsl:apply-templates select="text()" />
<xsl:variable name="ispartof" select="normalize-space(.)"/>
<xsl:variable name="numseqs" select="substring-after($ispartof,'p. ')"/>
<xsl:variable name="start" 
select="number(substring-before($numseqs,'-'))"/>

<foa>
<xsl:value-of select="$start" />
</foa>

</citation_g>

</xsl:template>
</xsl:element>

</xsl:template>

</xsl:stylesheet>

What I want to get from this utimately is:

<ario19990010001001>
<issn_x>0141-6200</issn_x>
<citation_g>21 (Aut 1998), p. 5-6<foa>5</foa></citation_g>
</ario19990010001001>


 -----------What is the basic principle I'm missing here?  Usually it's
 that I _can't_ get the other stuff to come through b/c I'm screwing up
 with apply-templates.  Now I got it backwards!  Note, I do have a
successful establishment of the foa element based on the variables set up.


I often get an error saying I can't nest xsl:template.  I can see doing a
call-template, but since I can't even get the 001 field's contents to become
the element type name for the element containing issn_x and citation_g, I
wanted to know what I was missing.  Currently, without the effort to make
the 001 field contents become the wrapping element type name, I am able to
get issn_x and citation_g/with foa, but I also get all the text() contents
of teh unselected fields as well.

Ideally, of course, I'd love to wrap issn_x and citation_g  inside the 001
tag, and make the 001 tag be named the same thing as its test string
contents, but then I'd just be dreaming.



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