Formulae in the European Finrep TaxonomySGCB

IX European Banking Supervisors XBRL Workshop.

Formulae in the European Finrep Taxonomy

Paris, October 29, 2008

Secrétariat général de la Commission bancaireSecrétariat général de la Commission bancaire

SGCB

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Formulae in the European Finrep TaxonomySGCB

• Target: Implementation of Finrep European Formulae

• Background: Experience with formula 2004 and translation to 2008 version (software provider)

• Test if and how each type of European formula can be processed with 2008 version.

• Needs: European Business specification and technical harmonization

Introduction

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Formulae in the European Finrep TaxonomySGCB

Summary

1 • French Background-3 different types of formulae-French Business Rules-From 2004 to 2008 Version

2 • European Formulae-Excel File for specification-Formulae types-Examples of architecture-Drawbacks to be considered

3 • Prototype For Implementation

-Example of automatic formulae generation

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Formulae in the European Finrep TaxonomySGCB

Three types of French formulae

• Simple aggregation all elements are primary elements that have the same

context and unitex: Calculation Link in all tables.several primary items in one formula with break down by dimension (ex: table 34 CL)

• dimensional aggregation primary item(s) with same concept name, identifier, period,

unit and dimension with each domain member one primary (ex: table 30B BR_49): «aggregator-compositor pattern»

French particularity with one formula for each primary item

• Simple formula addressing every element of the XBRL instanceex: between 100 and 200 formulae Table1.1 Form25

1 • French Background

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Formulae in the European Finrep TaxonomySGCB

Business Rules-Missing facts:

-2 taxonomies to manage different dates of reports (some CL are not triggered when no fact present witch is contrary to business people requirement who wanted an error to be raised)-Different acceptance radius if the bank belongs to « Grands groupes » or not.-Don’t need to deal with entity: one instance = one entity + one Taxonomy + one currency-Period: creation of an element « balance start » to differentiate starting and closing period with same date.-segment: no information to take into consideration for formulae in the segment tag

1 • French Background

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Formulae in the European Finrep TaxonomySGCB

From 2004 to 2008 Version

2004: No modularization, no extensibility but readability, pure XPath -Software provider rules implemented by a member of our subcontractor team-Ex: BR9 Table7-Equivalent of general variable in 2008 version

2008: Standardization, extensibility, modularity, general semantic -All CL, Aggregation Dimension and simple formulae implemented with

Formula 2008 specifications (Software Provider) -Ex: BR9 Table7 -So far: Temporary solution for architecture

2008: Specification limitations-Inter-instances formulae problem: Resolution outside the scope of

specification-Very difficult to implement chains (output of a formula becomes the input of another one)-No specification for output

1 • French Background

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Formulae in the European Finrep TaxonomySGCB

Excel Files for specificationOnly business specification : Excel File provided with Finrep 1.3.0

Types of European formulae

• Simple aggregation (around 500)ex: Calculation Link in all tables of 2008 Versionautomation is required- several primary items in one formula with break down by dimension (ex: table 30B BR_48)

• dimensional aggregation (around 100)- one primary (ex: table 30B BR_49)

• Simple formula (around 150)

ex:Table1.1 Form25

2 • European Formulae

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Formulae in the European Finrep TaxonomySGCB

Banco de España style guide

2 • European Formulae

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Formulae in the European Finrep TaxonomySGCB

2 • European Formulae

Trial implementation of French Formulae

• Simple aggregation: one file for each template (t-finrep-br-fr-2007-06-30-TableXX-formulae.xml)

• Other formulae: one file for all formulae

Other solutions

• Software vendor solutions: everything in one file

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Formulae in the European Finrep TaxonomySGCB

Drawbacks to be considered• Real Need of a shared architecture (best practice):

all editors should be able to deal with modification of a shared architectureequivalent of Frta for XBRL 2.1ex : -Spanish XSLT files and specification -Our Contractor implementation -Software provider implementation

• Defining shared business rules at European level?-periodicity of reports for example-need of being generic for national extensions

• Target: Firnrep with new ifrs• Formulae <> Business Intelligence = still superficial controls (no historical or complex statistical analysis) => not the same goal (control on a report) • Backward compatibility (CL, output) at least

2 • European Formulae

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Formulae in the European Finrep TaxonomySGCB

• java prototype: -500 calculations-Need of Mapping File between Excel cells and XBRL Taxonomies

(Tool of our Software provider) Jérôme

-Use of Bank of Spain xslt files

-Java components : Poi, Jdom

.

• No European Codification: use of xbrl names

3 • Prototype for implementation

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Formulae in the European Finrep TaxonomySGCB

• Basic Formulae can be implemented straight away

• Need of business specification at European level

• Need for standardization in the architecture for software developers

Conclusion