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XML/SGML enquiry and comparison: combining
Prerequisite Concepts		Related Syntax

In versions of OmniMark prior to V3, certain SGML and XML enquiries fail rather than abort when their component enquiries fail.

For example in the following, if there is no ancestor "chapter", then the test fails and the test is never done:

  local counter n
  ...
  do when occurrence of ancestor chapter = n
  ...
  done

Contrast this case with the following in which the test is in error if there are fewer than seven items on the counter shelf:

  local counter word-count
  local counter n
  ...
  do when word-count @ 7 = n
  ...
  done

Or the following:

  local counter n
  ...
  do when n = occurrence of ancestor chapter
  ...
  done

OmniMark has now standardized these cases so that SGML and XML enquiries of the first type are now also in error when the identified element does not exist. This new interpretation means that all of the following are equivalent in their behavior:

  when occurrence of ancestor chapter = n
  when n = occurrence of ancestor chapter
  when (occurrence of ancestor chapter) = n

Prerequisite Concepts      Aided translation types    Elements    Elements: counting    Elements: qualifiers

Related Syntax    element    occurrence    of ancestor

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