Is there any way to make it so that the attributes are not persisted if they
have no entry in the maps.xml?

That worked accept the result it returned was:

<?xml version="1.0" encoding="utf-8"?>
<top>
   <foo x="1" y="2"/>
   <bar x="1" y="2"/>
   <cars>
      <automobile red="1"/>
   </cars>
   <houses>
      <close deck="true" frontdoor="open"/>
   </houses>
</top>

but the expected result was:

<top>
 <foo x="1" y="2"/>
 <bar x="1" y="2"/>
 <cars>
  <automobile red="1"/>
 </cars>
 <houses>
  <close deck="true"/>
 </houses>
</top>

For my case I do not want  frontdoor="open" to be persisted because it has
no entry in the maps document:

<maps>
 <element source="car" target="automobile">
  <attribute source="blue" target="red"/>
  <attribute source="right" target="left"/>
 </element>
 <element source="house" target="close">
  <attribute source="balcony" target="deck"/>
 </element>
</maps>

Everything else looks perfect.

"Marrow" <m--a-r-r-o-w@m-a-r-r-o-w--s-o-f-t.com> wrote in message
news:eMAl%23VakEHA.3912@T......
> Hi Daniel,
>
> Try something like...
>
> <?xml version="1.0"?>
> <xsl:stylesheet version="1.0"
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
> <xsl:output method="xml" indent="yes"/>
> <xsl:variable name="maps" select="document('maps.xml',/)/maps/element"/>
>
> <xsl:template match="/">
>   <xsl:apply-templates/>
> </xsl:template>
>
> <xsl:template match="*">
>   <xsl:variable name="this-element-map" select="$maps[@source =
> local-name(current())]"/>
>   <xsl:choose>
>     <xsl:when test="$this-element-map">
>       <xsl:element name="{$this-element-map/@target}">
>         <xsl:apply-templates select="@*" mode="mapped">
>           <xsl:with-param name="attributes-map"
> select="$this-element-map/attribute"/>
>         </xsl:apply-templates>
>         <xsl:apply-templates/>
>       </xsl:element>
>     </xsl:when>
>     <xsl:otherwise>
>       <xsl:copy>
>         <xsl:apply-templates select="@* | node()"/>
>       </xsl:copy>
>     </xsl:otherwise>
>   </xsl:choose>
> </xsl:template>
>
> <xsl:template match="@*" mode="mapped">
>   <xsl:param name="attributes-map"/>
>   <xsl:variable name="this-attribute-map" select="$attributes-map[@source
=
> local-name(current())]"/>
>   <xsl:choose>
>     <xsl:when test="$this-attribute-map">
>       <xsl:attribute name="{$this-attribute-map/@target}">
>         <xsl:value-of select="."/>
>       </xsl:attribute>
>     </xsl:when>
>     <xsl:otherwise>
>       <xsl:copy/>
>     </xsl:otherwise>
>   </xsl:choose>
> </xsl:template>
>
> <xsl:template match="@* | text() | comment() | processing-instruction()">
>   <xsl:copy/>
> </xsl:template>
> </xsl:stylesheet>
>
>
> HTH
> Marrow
> http://www.marrowsoft.com - home of Xselerator (XSLT IDE and debugger)
> http://www.topxml.com/Xselerator
>
> "Daniel" <softwareengineer98037@y...> wrote in message
> news:%23EzPpOWkEHA.524@T......
> > Is this possible with an XSLT to merge these two XML documents and get
the
> > third document? If so any help, guidence, XSLT would be much
appreciated!
> >
> > Maps Document:
> >
> > <maps>
> >  <element source="car" target="automobile">
> >   <attribute source="blue" target="red"/>
> >   <attribute source="right" target="left"/>
> >  </element>
> >  <element source="house" target="close">
> >   <attribute source="balcony" target="deck"/>
> >  </element>
> > </maps>
> >
> >
> > Data Document:
> >
> > <top>
> >  <foo x="1" y="2"/>
> >  <bar x="1" y="2"/>
> >  <cars>
> >   <car blue="1"/>
> >  </cars>
> >  <houses>
> >   <house balcony="true" frontdoor="open"/>
> >  </houses>
> > </top>
> >
> >
> > Desired Target Document After XSLT Transformation
> >
> > <top>
> >  <foo x="1" y="2"/>
> >  <bar x="1" y="2"/>
> >  <cars>
> >   <automobile red="1"/>
> >  </cars>
> >  <houses>
> >   <house deck="true"/>
> >  </houses>
> > </top>
> >
> >
>
>