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1.1 Relationship to other work
1.3 Error codes
3 Enumeration items
4 Enumeration values
5 Enumeration value representation
6.1 Validation of enumeration items
6.2 Notes on validation
6.2.1 URI validation
6.2.2 Whitespace normalisation
6.2.3 Set value ordering and duplicate detection
B.1 extensible-enumerations-2.0.xsd (non-normative)
C Intellectual property status (non-normative)
D Acknowledgements (non-normative)
E Document History (non-normative)
F Errata Corrections incorporated in this document
1 Namespaces and namespace prefixes
Domain of allowed values
Expanded name URI
Set value enumeration concept
Single value enumeration concept
Business reports often have a need to report a value that is taken from, or dimensionally qualified by, one or more values taken from an enumerated list of permitted values. For example, a company may report its country of incorporation using a value from a list of country codes. Similarly, it may wish to report its revenue from one or more countries by dimensionally qualifying a revenue value with values taken from the same list of country codes.
xs:enumeration type provides a basic mechanism for
defining enumerated values, but they cannot be extended by XBRL extension
taxonomies, and individual values cannot be readily labeled in different
This specification leverages the mechanism for defining hierarchies of domain members defined in XBRL Dimensions [DIMENSIONS] to enable the definition of concepts which take values that are either a single and set-valued enumeration values.
This specification is the successor to Extensible Enumerations 1.0 [EXTENSIBLE ENUMERATIONS 1.0]. Extensible Enumerations 1.0 allows the definition of concepts that take a value that is one of a defined list of options. This specification adds the ability to also define concepts that take a value is one or more of a defined list of options. The requirements for this are documented more fully in the accompanying requirements document. This version is a new specification identified by a new namespace, and does not alter the behaviour required of a processor supporting Extensible Enumerations 1.0. Definitions from both specifications MAY co-exist within a single taxonomy, although it is recommended that taxonomy authors use a single version of the specification consistently wherever possible. Facts will be validated according to the relevant version of the specification, based on the namespace and localname of the datatype that the concept is derived from.
This specification depends upon the XBRL Specification [XBRL 2.1] and the XBRL Dimensions Specification [DIMENSIONS]. In the event of any conflicts between this specification and the specifications upon which it depends, this specification does not prevail.
This Specification uses a number of namespace prefixes when describing elements and attributes. These are:
The key words expanded name, local part, namespace name, NCName and QName in this document are to be interpreted as described in [XML Names].
The key words dimension declaration, domain member hierarchy, explicit dimension, and typed dimension in this document are to be interpreted as described in [DIMENSIONS].
An enumeration concept is a concept that is either a single value enumeration concept or a set value enumeration concept.
A single value enumeration concept is a concept with a data type of
enum2:enumerationItemType, or a type derived from it. The value of a single value enumeration concept is a single enumeration value.
A set value enumeration concept is a concept with a data type of
enum2:enumerationSetItemType, or a type derived from it. The value of a set value enumeration concept is an unordered set of enumeration values. Repetition of values within the set is not permitted, and ordering between values is not significant.
The set of allowed enumeration values is identified by attributes on the concept definition for the enumeration concept, as described in Section 4.
An enumeration value is an item taken from a domain of allowed values.
The domain of allowed values is obtained using the values of attributes present on an enumeration concept element declaration, as described below.
The domain head is the item identified by the
@enum2:domain attribute on the element declaration.
The domain of allowed values is the set of usable domain members obtained by following domain-member relationships starting from the
domain head in the extended link role identified by the
@enum2:linkrole attribute. If the element declaration has an
@enum2:headUsable attribute with an effective value of "true", then the domain of allowed values also includes the domain head, otherwise it does not.
The domain is obtained by following the rules defined for obtaining a domain of valid members for an explicit dimension as defined in [DIMENSIONS].
Within [DIMENSIONS] the domain-member relationships that form a domain have the attribute
@xbrldt:usable to provide a way of excluding members from the domain.
But because @xbrldt:usable only applies to the target of an effective domain-member relationship, the
@enum2:headUsable attribute exists to provide a way to exclude the head member itself.
This is required because no incoming arcs which have the domain head as their target are taken into account
when establishing the domain of allowed values.
The following constraints apply to all concept definitions [XBRL 2.1] for enumeration concepts:
@enum2:domainattribute MUST be specified (enum2te:MissingDomainError).
@enum2:domainattribute MUST identify a concept in the taxonomy that is in the
xbrli:itemsubstitution group and not in the
xbrldt:dimensionItemsubstitution groups (enum2te:InvalidDomainError).
@enum2:linkroleattribute MUST be specified (enum2te:MissingLinkRoleError).
@enum2:headUsableattribute MAY be specified to control whether the member identified by
@enum2:domainshould itself be included in the domain.
This specification makes use of URI-based notation to identify enumeration values. This notation expresses an XML expanded name as the combination of a namespace name (an absolute URI reference [URI]) and a local part, separated by the '#' character. This uniquely identifies an XML expanded name without the use of a context-specific, short-hand prefix, as used in QNames.
A value using this representation is referred to as an expanded name URI.
The following sections define additional validation to be applied to facts in an XBRL report. This validation is in addition to the validation required by [XBRL 2.1] and [DIMENSIONS].
Facts reported with a non-nil value against single value enumeration concepts MUST have a value that is an expanded name uri identifying a member in the domain of allowed values for the concept (enum2ie:InvalidEnumerationValue).
Facts reported with a non-nil value against a set value enumeration concept MUST have a value that is a space-separated list of expanded name URIs, each of which identifies a member in the domain of allowed values for the concept (enum2ie:InvalidEnumerationSetValue). The set of expanded name URIs MAY be empty.
The expanded name URIs reported in a fact value for a set value enumeration concept MUST be unique (enum2ie:RepeatedEnumerationSetValue).
The expanded name URIs reported in a fact value for a set value enumeration concept MUST be lexicographically ordered (enum2ie:InvalidEnumerationSetOrder).
The schema definitions of
enum2:enumerationSetItemType do not fully validate the format of the URI component of an expanded name URI. Full validation of the URI syntax is not required, as an invalid URI cannot match the namespace of a member in the relevant domain of allowed values and so will trigger enum2ie:InvalidEnumerationValue or enum2te:InvalidEnumerationSetValue as appropriate.
Note that the schema definition for
enum2:enumerationSetItemType has a base type of
xsd:token, which has an implicit value of
collapse for the
whiteSpace facet. This means that items in the list may be separated by any string of whitespace characters, and that the list may be preceded by, or followed by, any number of whitespace characters. Whitespace is not significant and need not be preserved.
The requirement for lexicographical ordering enables set equality to be determined with simple string comparison (after whitespace normalisation), and allows existing definitions of consistent and inconsistent duplicates to be applied to enumeration concepts.
This section contains XML files that form part of this specification. Each document has a standard Publication URL, at which the normative copy of the document is published. A non-normative copy of each document is included in this appendix for convenience.
All references to these documents made for the purposes of DTS Discovery MUST resolve to the Publication URL, after applying XML Base processing (where applicable) and resolving any relative URLs.
It should be noted that the path component of a URL is case-sensitive, and so must match exactly. Further, alternative hosts and schemes that happen to resolve to the same location are not considered equivalent and may not be used. See [URI] for more details on URL equivalence.
The requirement to reference documents by Publication URL does not prevent processors from substituting local copies of the documents for performance or other reasons.
XBRL taxonomies using this specification MAY import extensible-enumerations-2.0.xsd schema and MUST be schema valid according to the schema validation rules defined in [XML Schema Structures] and [XML Schema Datatypes].
XBRL instances using the elements whose type is defined in extensible-enumerations-2.0.xsd MUST be XML Schema valid according to validation rules defined in [XML Schema Structures] and [XML Schema Datatypes].
The Publication URL for this schema is https://www.xbrl.org/CR/2018-04-23/extensible-enumerations-2.0.xsd.
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This document could not have been written without the contributions of many people.
|12 October 2016||Paul Warren||
Initial Public Working Draft of version 1.1, addressing requirement for multi-valued enumerations.
|30 November 2016||Paul Warren||
Candidate Recommendation of version 1.1 released. Base type of "enumerationsItemType" changed to "tokenItemType".
|08 February 2017||Paul Warren||
Proposed Recommendation of version 1.1. Non-normative description of enum2:enumerationsItemType fixed.
|04 April 2017||Paul Warren||
Candidate Recommendation of version 1.1. Provided separate list and set types for multi-valued enumerations.
|05 September 2017||Paul Warren||
Initial Public Working Draft of 2.0. The 1.1 draft specification has been replaced by 2.0 due to a substantive change in approach (the use of Clark Notation rather than QNames for enumeration values)
|12 September 2017||Paul Warren||
Changed standard namespace prefix from enum to enum2. Added requirement for lexicographic ordering of set value facts.
|07 March 2018||Paul Warren||
Remove list value enumerations. Switch to uri#localname notation for values. Add set value dimensions.
|27 March 2018||Paul Warren||
Removed set value dimensions.
|23 April 2018||Paul Warren||
Candidate Recommendation of version 2.0.
This appendix contains a list of the errata that have been incorporated into this document. This represents all those errata corrections that have been approved by the XBRL International Specification Maintenance Working Group (SWG) up to and including 23 April 2018. Hyperlinks to relevant e-mail threads may only be followed by those who have access to the relevant mailing lists. Access to internal XBRL mailing lists is restricted to members of XBRL International Inc.
No errata have been incorporated into this document.