Your question isn't really very clear but I guess something like this:

a) you appear to be generating html or xhtml in which case you don't
want selected="true" as that would be invalid, you want
selected="selected".

b) take the identity transformation (from the XSLT rec, or the faq or
archives of this list) then add

<xsl:template match="option[@value=3]">
 <option select="selected">
 <xsl:copy-of select="@*|node()"/>
 </option>
</xsl:template>

David




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