Re: equivalent for 'while'

  How could I then place conditions when processing this XML doc such that 
  it continues searching for a <CHILD> element until it finds  
  'abcGrandChild' ?


The way you phrased that implies a time ordering that is not implied by
the language specification. instructions may be processed in arbitrary
order or in parallel.

Don't try to second guess _how_ the system will do it, just state which
nodes you want to process, which in this case is all the ones before
'abcGrandChild'

so
<xsl:for-each select="DEFCONCEPT[CHILD='abcGrandChild']/preceding-sibling::DEFCONCEPT">
....

for example.

David

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