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__NAME__ purpose
perform lookup in another database
__NAME__ see also
__NAME__ description
The filter performs a lookup in another database.
See <xref linkend='lookup_examples'/> for clarification.
__NAME__ example: Filter example
Suppose we have two databases, <database>products</database> and
<database>support</database>, as follows:
code price description
144 12 Item 144
145 84 Item 145
146 314 Item 146
code product_supported
144 0
145 1
146 -1
Then, performing
<code>[filter]144[/filter]</code> would
yield <literal>0</literal>.