extdBasicTypes.xsd, part of GML 3.3. Copyright (c) [2011,2018] Open Geospatial Consortium, Inc. To obtain additional rights of use, visit http://www.opengeospatial.org/legal/. gmlxbt:LanguageStringType adds an optional xml:lang attribute to xs:string for the use within the GML schema and in GML application schemas. gmlxbt:CodeType is a generalized type to be used for a term, keyword or name. It adds a XML attribute codeSpace to a term, where the value of the codeSpace attribute (if present) shall indicate a dictionary, thesaurus, classification scheme, authority, or pattern for the term. gmlxbt:CodeWithAuthorityType requires that the codeSpace attribute is provided in an instance. The value of this property is a text description of the object with optional xml:lang attribute. The value of this property is a text description of the object with optional xml:lang attribute.