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The XBRL Open Information Model provides a syntax-independent definition of the content of an XBRL report. A number of alternative syntaxes are defined as concrete representations of the model. In order to achieve consistency between these representations, this document provides a number of definitions which may be used across these different formats.
The key words MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD, SHOULD NOT, RECOMMENDED, MAY, and OPTIONAL, in this specification, are to be interpreted as described in [IETF RFC 2119].
The keywords expanded name, NCName and QName are to be interpreted as described in the XML Names specification [XML Names].
The keywords Unit Core Aspect are to be interpreted as described in the Open Information Model [OIM].
Many values in the Open Information Model are XML expanded
names, that is, the combination of a namespace URI and a localname.
This specification uses QName notation in the form
prefix:localname to refer to these, where the prefix
is a short string representing a full namespace URI. The prefixes used by this
specification are defined below. These prefixes are reserved prefixes.
The Open Information Model makes extensive use of expanded names ([XML Names]) to provide globally unique identifiers. These are a namespace URI/localname pair. In order to reduce size and improve readability, it is convenient to use a QName-like mechanism for representing these (and some other) values, where the globally unique namespace-URI is replaced with a compact, document-scoped prefix. The mechanism used is referred to as an SQName ("Simplified QName").
An SQName has the following format:
The prefix MUST be a valid NCName (oimce:invalidSQNamePrefix) and MUST correspond to a key in the prefix map (oimce:unboundSQNamePrefix), and the namespace URI for identifier is taken from the corresponding value in the map.
Unlike QNames, the localname may be any string, including those containing the colon (":") character; the prefix and localname in an SQName are separated by the first colon character. Where an SQName is used to represent an expanded name, the localname will be a valid NCName.
A prefix map is a URI map that is used to resolve the prefix component of a QName or SQName to a URI.
A URI map is a set of key/value pairs that is used to resolve the URI alias to full URIs. The location and format of a URI map is defined by the specification for the representation in which it is used, but it MUST conform to the following constraints:
It should be noted that some of the constraints listed above, such as the requirement for URI aliases to be unique within the map, may be enforced by syntactic or structural constraints of the format in which the map is represented. In this case, implementations should raise the appropriate error for that format, rather than the code listed above.
The Unit Core Aspect defines units in terms of the combination of QNames by defining a list of numerators and a list of denominators. Reflecting this in concrete representations can be somewhat cumbersome, particularly as analysis the structure of units is expected to be a relatively uncommon operation compared to simply comparing units for equivalence, or rendering them to a user.
This section defines a standardised string representation for units, allowing units to be captured using a single, simple string value. This has the property that, provided that a consistent set of namespace prefixes are used, a given unit will have the single representation meaning that equivalence of units can be determined by a simple string comparison.
This representation is obtained as follows:
Whitespace is not permitted anywhere in the string representation, and the use of SQNames ensures that a 1:1 mapping between prefixes and namespaces is available thus ensuring that equivalent units appearing within the same document are represented with the same string.
The following list show a set of valid unit string representations.
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|14 December 2016||Paul Warren||
Candidate Recommendation. The contents of this specification were previously included in Public Working Drafts of the xBRL-JSON and OIM specifications.
|02 May 2017||Paul Warren||
Second Candidate Recommendation
|12 December 2018||Paul Warren||
Third Candidate Recommendation
|12 June 2019||Paul Warren||
Fourth Candidate Recommendation
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 12 June 2019. 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.