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This document defines requirements for a modular extension to the XBRL v2.1 Specification [XBRL 2.1] that enables efficient, stream-based processing of very large XBRL instance documents. The background to this module is described in the Working Group Note, "Notes on the Processing of Large XBRL Instances".
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 key words concept, context, fact, footnote, instance and unit. in this document are to be interpreted as described in the XBRL Specification [XBRL 2.1].
The solution MUST enable an XBRL instance document to be read a single time, in document order, in such a way that each XBRL fact in the document can be fully understood using a processing approach that has memory usage that is independent of the number of facts, contexts, units and footnotes that appear in the document. The solution MAY provide additional functionality that allows processing with memory usage that is independent of only a subset of these facets.
In this context, "fully understood" means that the processor has access to the union of the information defined in a fact, its associated context, its associated unit (if any) and its associated footnotes (if any). In the case of footnotes, the processor MUST also be able to determine that it has access to all footnotes for the fact. This is not an issue for contexts (as there must be exactly one for each fact), or for units (as there must be at most one for each fact, and it is possible to determine from the fact whether or not it has units).
The solution MUST provide a mechanism that allows instance documents to declare their conformance with the solution in a manner that can be quickly obtained by a consuming processor. This is to allow consumers to demand that submitters conform to the solution, and to quickly reject documents that do not.
The solution MUST describe validation rules and associated error codes to be applied to an instance document that declares itself to be conformant with the solution.
XBRL instance documents that conform to the solution MUST be valid XBRL v2.1 instance documents. This ensures that, performance issues aside, they can be consumed by existing, XBRL v2.1 conformant tools.
As the XBRL Dimensions v1.0 specification [DIMENSIONS] is built using XBRL v2.1 [XBRL 2.1] syntax, this backwards compatibility automatically extends to instance documents using the XBRL Dimension specification.
Similarly, XBRL Formula v1.0 [FORMULA] processors, and other processors built to consume XBRL v2.1 instance documents, will be able to consume documents conforming to this solution, but it is not a requirement that this specification enables Formula processing to be possible using constant memory.
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This document could not have been written without the contributions of many people.
|22 October 2012||Paul Warren||
|18 December 2012||Paul Warren||
Included reference to Formula processing in backwards compatibility section.
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 Base Specification and Maintenance Working Group up to and including 06 March 2013. 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.