ContentCatalog xml:lang ContentObject SourceObject SIF_RefObject Location ReferenceType Status Title Description Author LanguageCode GradeLevels SubjectAreas SubjectArea MediaTypes MediaType LearningStandards Document Title StandardsSettingBody Country StateProvince NCESId SettingBodyName StatementCodes StatementCode InstructionalLevel TechnicalRequirements Duration Units CurriculumHierarchyList CurriculumHierarchy Level Description ParentLevel Prerequisites Prerequisite Adaptations Size Cost SIF_Metadata SIF_ExtendedElements