Metadata_Metamodel_Type
The Type structure describes the type information of a typed element in the interface definiton language. The following elements in the metamodel are typed:
- Field element in a structure element. See StructureInfo.fields
- Parameter element in an operation element. See OperationInfo.params
- Result element in an operation element. See OperationInfo.output The type could be one of the three following categories:
- Built-in types: These are types present in the interface definition language type system. They are provided by the infrastructure.
- User defined named type: API designers can create custom types and use them for the typed elements. These types have a unique identifier.
- Generic type instantiation: The language infrastructure also provides generic types such as list, map, set and so on. An instantiation of one of these generic types could also be used for the typed elements.
{
"category": "string",
"builtin_type": "string",
"user_defined_type": {
"resource_type": "string",
"resource_id": "string"
},
"generic_instantiation": {
"generic_type": "string",
"element_type": "Metadata_Metamodel_Type Object",
"map_key_type": "Metadata_Metamodel_Type Object",
"map_value_type": "Metadata_Metamodel_Type Object"
}
}The Type.Category enumerated type provides enumeration value for each category of the type.
BUILTIN : The type is one of the built-in types specified in Type.BuiltinType
USER_DEFINED : The type is one of the user defined named types.
GENERIC : The type is an instantiation of one of the generic types.
The Type.BuiltinType enumerated type provides enumeration value for each of the built-in types present in the interface definition language type system.
VOID : The built-in type is a void. The value is unset.
BOOLEAN : The built-in type is a boolean. The value is true or false.
LONG : The built-in type is a long. The value is a 64 bit signed integer.
DOUBLE : The built-in type is a double. The value is a 64 bit floating point number.
STRING : The built-in type is a string. The value is a variable-length sequence of zero or more unicode characters.
BINARY : The built-in type is a binary. The value is a variable-length sequence of zero or more bytes.
SECRET : The built-in type is a secret. The value is a variable-length sequence of zero or more unicode characters. The value contains sensitive data that should not be printed or displayed anywhere.
DATE_TIME : The built-in type is a datetime. The value should be in the UTC timezone and the precision is milliseconds.
ID : The built-in type is an ID. The value represents an identifier for a resource.
URI : The built-in type is an URI. The value follows the IRI specification in RFC 3987.
ANY_ERROR : The built-in type is an arbitrary error type. This is used if the value of a typed element can be one of any user defined named type which is an error.
DYNAMIC_STRUCTURE : The built-in type is a dynamic structure. This is used if the value of a typed element can be one of any user defined named type.
OPAQUE : The built-in type is an opaque. This is used if the value of a typed element could be of any type and the actual type will be known only during the execution of the API. This is mostly used in infrastructure services.
The UserDefinedType structure contains the metamodel type information of a typed element whose type is a user defined named type.
The GenericInstantiation structure describes the type information of a typed element when the type is an instantiation of one of the generic types provided by the infrastructure.