At-least expressions
On occasion, it is helpful to specify that some number
of conditions must be true before an object is considered to match.
These expressions are called at-least expressions
because at least X subexpressions must match an object
before the object matches the overall expression.
The syntax for an at-least expression is to give the keywords
"at
least" followed by a number, and then by a list of expressions
in parentheses. For example:at least 2 (att: size=1mb, att: “system metadata/owner”=joe, att:
"object name"=foo.doc, att: "modified date">2009-03-28 )This example specifies that at least two of the four conditions must be true before any object is considered to match the overall expression.
Each subexpression in the list can be arbitrarily complex, but normally they are one condition. Each subexpression in the list must be separated from the others with a comma.