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2.3.1.1 Qualified String Tokens

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The quoted-string-value and unquoted-string-value elements can be qualified by a minus or a plus character.

§ "+" denotes tokens that MUST be present in an item for a match. These are token inclusions.

§ "-" denotes tokens that MUST NOT be present in an item for a match. These are token exclusions.

The exact semantics of inclusions and exclusions depend on whether the implicit operator (see section 2.1.11 for details) is AND or OR, as specified in sections 2.3.1.1.1 and 2.3.1.1.2.