The query element is used to specify a finder or select query. It contains an optional description of the query; the specification of the finder or select method it is used by; a specification of the return type mapping, if any, if the query is for a select method; and the EJB QL query string that defines the query. Queries that are expressible in EJB QL must use the ejb-ql element to specify the query. If a query
is not expressible in EJB QL, the description element should be used to describe the semantics of the query and the ejb-ql element should be empty.