Template:Wb/lad/Allbooks category/parent
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This template attempts to include this allbooks category in one of its parents.
Usage
[edit source]{{Allbooks category/parent|parent=<parent>|subject=<subject>}}
where <subject> is the name of the subject page associated with this allbooks category (thus, Subject:Wb/lad/<subject>), and <parent> is a parent name provided by that subject page (thus, it is the value of a parameter {{{{parent}}} or {{{parent2}}} passed to a call to {{Wb/lad/Subject page}} on page Subject:Wb/lad/<subject>).
This template then checks that the parent subject page exists (Subject:<parent>) and is correctly formatted for automatic extraction of parameter values, and that its associated allbooks category exists; if not, it calls {{Wb/lad/Allbooks category/error}}. If all is well, it adds this allbooks category to the parent's allbooks category.