extract and print values only when they exist using xslt - xslt-3.0

Question

The source xml is:
<?xml version="1.0" encoding="UTF-8" ?>
<mr:collection
xmlns:mr="http://www.lc.gov/mr2/slim"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.lc.gov/mr2/slim http://www.lc.gov/standards/mrxml/schema/mr21slim.xsd">
<mr:rc>
<mr:ctr tg="1000">311</mr:ctr>
<mr:dtf tg="12000" i1="1" i2=" ">
<mr:sbf cd="d">John Diter</mr:sbf>
</mr:dtf>
</mr:rc>
</mr:collection>
the xsl that i use:
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:d="http://www.example.com"
xpath-default-namespace="http://www.lc.gov/mr2/slim"
xmlns:mr="http://www.lc.gov/mr2/slim"
exclude-result-prefixes="#all"
expand-text="yes"
version="3.0">
<xsl:mode on-no-match="shallow-copy"/>
<xsl:output method="xml" indent="yes"/>
<xsl:template match="collection">
<O-PM>
<ListRcs>
<xsl:apply-templates/>
</ListRcs>
</O-PM>
</xsl:template>
<xsl:template match="rc">
<rc>
<xsl:apply-templates/>
</rc>
</xsl:template>
<xsl:template match="mr:ctr[#tg = 1000]">
<xsl:variable name="dz" as="xs:string">{tg ='1000'}!</xsl:variable><d:z xml:lang="en">{normalize-space($dz)}</d:z>
</xsl:template>
<xsl:template match="mr:dtf[#tg = 12000]">
<xsl:variable name="ds" as="xs:string">{sbf[#cd = 'a']}!</xsl:variable><d:s xml:lang="en">{normalize-space($ds)}</d:s>
<xsl:variable name="dp" as="xs:string">{sbf[#cd = 'c']}!</xsl:variable><d:p>{normalize-space($dp)}</d:p>
<xsl:variable name="dc" as="xs:string">{sbf[#cd = 'd']}!</xsl:variable><d:c>{normalize-space($dc)}</d:c>
</xsl:template>
</xsl:stylesheet>
Current output:
<?xml version="1.0" encoding="UTF-8"?>
<O-PM>
<ListRcs>
<rc>
<d:z xmlns:d="http://www.example.com">false!</d:z>
<d:s xmlns:d="http://www.example.com" xml:lang="en">!</d:s>
<d:p xmlns:d="http://www.example.com">!</d:p>
<d:c xmlns:d="http://www.example.com">John Diter!</d:c>
</rc>
</ListRcs>
</O-PM>
Desired output:
<?xml version="1.0" encoding="UTF-8"?>
<O-PM>
<ListRcs>
<rc>
<d:z xmlns:d="http://www.example.com">311</d:z>
<d:c xmlns:d="http://www.example.com">John Diter!</d:c>
</rc>
</ListRcs>
</O-PM>
For starters i need to get as output the value of tg = 1000 and not false,
and secondly, how can one print only the values that exist?
In the above example only the value that matches the criterion cd = d is TRUE.
https://xsltfiddle.liberty-development.net/asoTKA/2

Answer 1

It seems, this time you can just match on the elements that interest you:
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:d="http://www.example.com"
xpath-default-namespace="http://www.lc.gov/mr2/slim"
xmlns:mr="http://www.lc.gov/mr2/slim"
exclude-result-prefixes="#all"
expand-text="yes"
version="3.0">
<xsl:mode on-no-match="shallow-skip"/>
<xsl:output method="xml" indent="yes"/>
<xsl:template match="collection">
<O-PM>
<ListRcs>
<xsl:apply-templates/>
</ListRcs>
</O-PM>
</xsl:template>
<xsl:template match="rc">
<rc>
<xsl:apply-templates/>
</rc>
</xsl:template>
<xsl:template match="mr:ctr[#tg = 1000]">
<d:z xml:lang="en">{.}</d:z>
</xsl:template>
<xsl:template match="dtf[#tg = 12000]/sbf[#cd = 'd']">
<d:c>{.}!</d:c>
</xsl:template>
</xsl:stylesheet>
https://xsltfiddle.liberty-development.net/asoTKA/3

Answer 2

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:d="http://www.example.com"
xpath-default-namespace="http://www.lc.gov/mr2/slim"
xmlns:mr="http://www.lc.gov/mr2/slim"
exclude-result-prefixes="#all"
expand-text="yes"
version="3.0">
<xsl:mode on-no-match="shallow-copy"/>
<xsl:output method="xml" indent="yes"/>
<xsl:template match="collection">
<O-PM>
<ListRcs>
<xsl:apply-templates/>
</ListRcs>
</O-PM>
</xsl:template>
<xsl:template match="rc">
<rc>
<xsl:apply-templates/>
</rc>
</xsl:template>
<xsl:template match="mr:ctr[#tg = 1000]">
<xsl:variable name="dz" as="xs:string"><xsl:value-of select="."/></xsl:variable>
<d:z xml:lang="en"><xsl:value-of select="normalize-space($dz)"/></d:z>
</xsl:template>
<xsl:template match="mr:dtf[#tg = 12000]">
<xsl:variable name="dc" as="xs:string">
<xsl:if test="mr:sbf[#cd = 'd']"><xsl:value-of select="normalize-space(.)"/> </xsl:if>
</xsl:variable>
<d:c xml:lang="en"><xsl:value-of select="normalize-space($dc)"/></d:c>
</xsl:template>
</xsl:stylesheet>
https://xsltfiddle.liberty-development.net/asoTKA/5