With the metadata query engine, query expressions have this format:
[+|-]criterion [[+|-]criterion]...
In this expression, [+|-] is an optional Boolean operator and criterion is one of:
•A simple criterion as described in Criterion format.
•One or more criteria in parentheses, in this format:
([+|-]criterion [[+|-]criterion]...)
In this expression criterion can be a simple criterion or one or more criteria in parentheses.
For example, here is one possible query expression:
-(namespace:"finance.europe") +(retention:0 index:1)
Query expressions can contain only valid UTF-8 characters.
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