Query expressions

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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