OSID - osid.search.terms.HeadingTerm Service Interface Definition

Interface	osid.search.terms.HeadingTerm
Implements	`osid.search.QueryTerm`
Used By	`osid.configuration.ValueQueryInspector`
Description	A term for a `Heading` query.
Method	getHeading
Description	Gets the `Heading` in this term.
Return	`osid.mapping.Heading`	the heading
Errors	ILLEGAL_STATE	`isWildcard()` is `true`
Compliance	`mandatory`	This method must be implemented.