19 declare(strict_types=1);
    26     case GENERAL_STRUCTURE = 
'general_structure';
    27     case GENERAL_AGGREGATION_LEVEL = 
'general_aggregation_level';
    28     case GENERAL_COVERAGE = 
'general_coverage';
    29     case GENERAL_IDENTIFIER_CATALOG = 
'general_identifier_catalog';
    30     case LIFECYCLE_STATUS = 
'lifecycle_status';
    31     case LIFECYCLE_CONTRIBUTE_ROLE = 
'lifecycle_contribute_role';
    32     case LIFECYCLE_CONTRIBUTE_PUBLISHER = 
'lifecycle_contribute_publisher';
    33     case METAMETADATA_IDENTIFIER_CATALOG = 
'metametadata_identifier_catalog';
    34     case METAMETADATA_CONTRIBUTE_ROLE = 
'metametadata_contribute_role';
    35     case METAMETADATA_SCHEMA = 
'metametadata_schema';
    36     case TECHNICAL_REQUIREMENT_TYPE = 
'technical_requirement_type';
    37     case TECHNICAL_REQUIREMENT_BROWSER = 
'technical_requirement_browser';
    38     case TECHNICAL_REQUIREMENT_OS = 
'technical_requirement_os';
    39     case TECHNICAL_OTHER_PLATFORM_REQUIREMENTS = 
'technical_other_platform_requirements';
    40     case TECHNICAL_FORMAT = 
'technical_format';
    41     case EDUCATIONAL_INTERACTIVITY_TYPE = 
'educational_interactivity_type';
    42     case EDUCATIONAL_LEARNING_RESOURCE_TYPE = 
'educational_learning_resource_type';
    43     case EDUCATIONAL_INTERACTIVITY_LEVEL = 
'educational_interactivity_level';
    44     case EDUCATIONAL_SEMANTIC_DENSITY = 
'educational_semantic_density';
    45     case EDCUCATIONAL_INTENDED_END_USER_ROLE = 
'educational_intended_end_user_role';
    46     case EDUCATIONAL_CONTEXT = 
'educational_context';
    47     case EDUCATIONAL_DIFFICULTY = 
'educational_difficulty';
    48     case EDUCATIONAL_TYPICAL_AGE_RANGE = 
'educational_typical_age_range';
    49     case RIGHTS_COST = 
'rights_cost';
    50     case RIGHTS_CP_AND_OTHER_RESTRICTIONS = 
'rights_cp_and_other_restrictions';
    51     case RIGHTS_DESCRIPTION = 
'rights_description';
    52     case RELATION_KIND = 
'relation_kind';
    53     case RELATION_RESOURCE_IDENTIFIER_CATALOG = 
'relation_resource_identifier_catalog';
    54     case CLASSIFICATION_PURPOSE = 
'classification_purpose';
    55     case CLASSIFICATION_KEYWORD = 
'classification_keyword';
    56     case CLASSIFICATION_TAXPATH_SOURCE = 
'classification_taxpath_source';