# ISO 19115-3 Codelist Report

## Codelists from the Metadata with Schema Extensions (mex) Namespace

Scope | Codelists from the Metadata with Schema Extensions (mex) Namespace
Field of Application | ISO TC211 Metadata Standards
Version (Date) | 1.0 ()

## MD_DatatypeCode ( MD_DatatypeCode ):

Description: datatype of element or entity

Entry | Definition
--- | ---
MD_DatatypeCode_class | descriptor of a set of objects that share the same attributes, operations, methods, relationships, and behaviour
MD_DatatypeCode_codelist | flexible enumeration useful for expressing a long list of values, can be extended
MD_DatatypeCode_enumeration | data type whose instances form a list of named literal values, not extendable
MD_DatatypeCode_codelistElement | permissible value for a codelist or enumeration
MD_DatatypeCode_abstractClass | class that cannot be directly instantiated
MD_DatatypeCode_aggregateClass | class that is composed of classes it is connected to by an aggregate relationship
MD_DatatypeCode_specifiedClass | subclass that may be substituted for its superclass
MD_DatatypeCode_datatypeClass | class with few or no operations whose primary purpose is to hold the abstract state of another class for transmittal, storage, encoding or persistent storage
MD_DatatypeCode_interfaceClass | named set of operations that characterize the behaviour of an element
MD_DatatypeCode_unionClass | class describing a selection of one of the specified types
MD_DatatypeCode_metaClass | class whose instances are classes
MD_DatatypeCode_typeClass | class used for specification of a domain of instances (objects), together with the operations applicable to the objects. A type may have attributes and associations
MD_DatatypeCode_characterString | textual information
MD_DatatypeCode_integer | numerical field
MD_DatatypeCode_association | semantic relationship between two classes that involves connections among their instances

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## MD_ObligationCode ( MD_ObligationCode ):

Description: obligation of the element or entity

Entry | Definition
--- | ---
MD_ObligationCode_mandatory | element is always required
MD_ObligationCode_optional | element is not required
MD_ObligationCode_conditional | element is required when a specific condition is met

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