[xsl] naive identity transform question

I'm sure this is a very straightforward task, but I'm missing something
fundamental about the identity transformation.

I want to copy an xml file exactly except if nodeX lacks a childY write
element Y.

The consensus on the identity transform suggested something like this:

xsl file identity.xsl

  <xsl:template match="node()|@*">
      <xsl:copy>
          <xsl:apply-templates select="@*|node()"/>
      </xsl:copy>
  </xsl:template>

xsl file intended transformation.xsl

  <xsl:import href="identity.xsl"/>

  <xsl:template match="//snotes:SourceNote[not(snotes:sourceDate)]">
      <xsl:element 
name="sourceDate"><xsl:text>0000-00-00</xsl:text></xsl:element>
  </xsl:template>

IE: copy all elements complete, except where //snotes:SourceNote has no
snotes:sourceDate child. In that case, write a snotes:sourceDate element
with the value 0000-00-00.

Anyone willing to point out the obvious to the naive?

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