Sphinx a user-friendly assertion language David North Senior Developer, CoreFiling Eurofiling Workshop, Luxembourg, December 2013.

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Presentation transcript:

Sphinx a user-friendly assertion language David North Senior Developer, CoreFiling Eurofiling Workshop, Luxembourg, December 2013

What is Sphinx? Domain-specific language for making assertions about XBRL facts High-level, semantic, based on an n- dimensional world Not XML Designed for humans to write and edit directly Proprietary

History 2009 – first prototypes 2011 – stable language reaches – version 2.0 incorporating real-world feedback requiring breaking changes 2013 – (later abandoned) attempt to offer the Sphinx IP to XBRL International

The requirements Sphinx grew from XBRL US (XUSI) – development of the XBRL US Consistency Checks for quality/consistency of SEC filings CIMA – regulator needing to check quality/consistency of incoming instances Replaced a stopgap spreadsheet-based solution

Who uses it? XUSI CIMA HMRC

Proprietary: Disadvantages Not an XII standard Fewer options for implementations Difficult for a regulator to mandate its usage by filers Can't be part of DTS

Proprietary: Advantages High quality tools available from CoreFiling Fast evolution of the language in response to customer feedback

What can it be used for? Rapid creation of business and accounting rules Typical checks might include: – X must be reported – Co-constraints (if X is reported, Y must be too) – Comparing data across dimensions

The language Based on item expressions The most basic: [ ] Represents the table of all items in the instance. Operations on it apply to every cell in turn Restrict by axes (“aspects” in XBRL formula) –FooConcept[ ] – restriction to facts with FooConcept –[Geography=UK, Product=Cheese] – restricts dimensions

Lining up How is the following expression evaluated? Revenue[ ] = SalesRevenue[ ] + RentRevenue[ ]

Examples Please refer to accompanying file “Sphinx Examples.txt”

Tools Rules authored in SpiderMonkey, potentially alongside taxonomy development – Can test against instances here Can plug authored “rulebase” into other CoreFiling tools both for GUI-based instance validation and command-line/web based validation (e.g. filter gateway).

Sphinx vs XBRL formula Sphinx does lining up (implicit filtering) by default Sphinx cannot do fact creation Sphinx cannot use XPath User-defined Sphinx functions are in- language only (no ability to make them implementation-defined)

Questions?