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Re: get immediat preceeding node, if it is a comment


  preceding-sibling::node()[1][normalize-space()][self::comment()]

  This will select the immediately preceding-node, should that return true
  for normalize-space() and self::comment().

yes


  preceding-sibling::node()[normalize-space()][1][self::comment()]

  This will select the first in a list of nodes that return true for
  normalize-space() and self::comment().

No, that would be

preceding-sibling::node()[normalize-space()][self::comment()][1]

What you have,
preceding-sibling::node()[normalize-space()][1][self::comment()]

selects the first non-whitespace-text node if it is a comment.

David

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