Re: testing 1st child

 <xsl:when
  test="child::figure|child::table|child::warning|child::caution|child::note">

child:: is the default axis so that is the same as

<xsl:when
test="figure|table|warning|caution|note">

and tests if the current node has any of those children.
You only want to test the first child, so select that first, then use the
self:: axis to see what you have:

<xsl:when
test="*[1][self::figure or self::table or self::warning or self::caution or self::note]">

David

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