Three possible values of use Definition of a type to contain mixed text and XHTML markup Root element of the XBRL Linkbase Role Registry For arc roles, whether the "from" concept is abstract; otherwise empty. For arc roles, whether the "to" concept is abstract; otherwise empty. This is the role URI being defined. The XBRL International status of this role. PWD, CR, REC, NIE, PROPOSED, IWD, ACK or RR. Effective date of this version of the role; all versions of the same role with earlier dates are effectively superseded Lists any attributes that are allowed or required. The XBRL version for which this an extension. In principle, a role could be "promoted" into a standard role in some future version of the specification. The XBRL edition date and beyond for which this is an extension. Whether elements using this role impact XBRL instance validation. If so, then the role cannot appear in FRTA taxonomies [FRTA]. Whether elements using this role impact XBRL instance validation. If so, then the role cannot appear in FRTA taxonomies [FRTA]. A textual or pseudocode specification of the intended impact on XBRL validation of instances. If Instance Validation Impact is "optional" then this would be empty. A URI locating a testcases element containing testcase elements with relative URIs to files illustrating valid and invalid usage. A statement of the requirements that gave rise to this role. Requirements in different languages are distinguished using the xml:lang attribute. The meaning of the role described in the same way as if it were in the Specification. Definitions in different languages are distinguished using the xml:lang attribute. The absolute URI where the schema defition of the role or arc role is found.