# Codelist Catalog

This report describes the ISO TC211 codelist catalogs, the codelists they contain, and the values and definitions of the codes.

Please contact Ted Habermann if you have questions or suggestions.

## Catalog

Name: 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: 1.1
Date: 2017-09-10
Number of CodeLists: 2
Number of items: 18

## Codelists

## MD_DatatypeCode :

Description: datatype of element or entity
CodeSpace: http://standards.iso.org/iso/19115/-3/mex/1.0
Number of items: 15

Entry | Definition
--- | ---
class | descriptor of a set of objects that share the same attributes, operations, methods, relationships, and behaviour
codelist | flexible enumeration useful for expressing a long list of values, can be extended
enumeration | data type whose instances form a list of named literal values, not extendable
codelistElement | permissible value for a codelist or enumeration
abstractClass | class that cannot be directly instantiated
aggregateClass | class that is composed of classes it is connected to by an aggregate relationship
specifiedClass | subclass that may be substituted for its superclass
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
interfaceClass | named set of operations that characterize the behaviour of an element
unionClass | class describing a selection of one of the specified types
metaClass | class whose instances are classes
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
characterString | textual information
integer | numerical field
association | semantic relationship between two classes that involves connections among their instances

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## MD_ObligationCode :

Description: obligation of the element or entity
CodeSpace: http://standards.iso.org/iso/19115/-3/mex/1.0
Number of items: 3

Entry | Definition
--- | ---
mandatory | element is always required
optional | element is not required
conditional | element is required when a specific condition is met

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Stylesheet: CT_CodelistHTML.xsl Version: 2017-09-10