Finding all occurences of a node

<root>
  <sub1>
    <sub2>
      <myowntag id="x.y.z" />
      <sub3>
        <myowntag id="a.b.c" />
      </sub3>
    </sub2>
  </sub1>
</root>

<xsl:template match="child::sub1/child::*">
  <xsl:copy-of select="."/>
</xsl:template>

But how can I replace all occurences of <myowntag>? Something like
<xsl:template match="myowntag">
   ....
</xsl:template match>
doesn't work.