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The follwing rule

<s:pattern name="Glossary term definition constraint">
<s:rule context="db:termdef">
<s:assert test="count(db:glossterm) !=
1">A termdef must
contain a glossterm</s:assert>
</s:rule>
</s:pattern>

should be inverted (count(...) = 1).

This bug was reported by Hussein Shafie