default transform

i have a scenario where i need to apply simple transforms on select
internal nodes, and pass the remaining nodes to output as is. how do i
achieve this in xsl? how do i specify the part "remaining nodes"?

<xsl:template match="//A/B">
   <B> new text </B>
</xsl:template>

<!-- remaining tree needs to go as is to output xml -->

thanks and regards,
pankaj