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1 {{box title="**Contents**"}}
2 {{toc/}}
3 {{/box}}
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5 == 9.1 Scope ==
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7 The scope of this section is to define both best practices and mandatory behaviour for specific aspects of transformation between different formats of [[SDMX>>doc:sdmx:Glossary.Statistical data and metadata exchange.WebHome]].
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9 == 9.2 Groups and Dimension Groups ==
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11 === 9.2.1 Issue ===
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13 Version 2.1 introduces a more granular mechanism for specifying the relationship between a Data [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]] and the [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] to which the [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] applies. The technical construct for this is the [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] Group. This [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] Group has no direct equivalent in versions 2.0 and 1.0 and so the application transforming data from a version 2.1 [[data set>>doc:sdmx:Glossary.Data set.WebHome]] to a version 2.0 or version 1.0 [[data set>>doc:sdmx:Glossary.Data set.WebHome]] must decide to which construct the [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] value, whose [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]] is declared in a [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] Group, should be attached. The closest construct is the “Series” [[attachment level>>doc:sdmx:Glossary.Attachment level.WebHome]] and in many cases this is the correct construct to use.
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15 However, there is one case where the [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] MUST be attached to a Group in the version 2.0 and 1.0 message. The conditions of this case are:
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17 1. A Group is defined in the [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] with exactly the same [[Dimensions>>doc:sdmx:Glossary.Dimension.WebHome]] as a [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] Group in the same [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]].
18 1. The [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]] is defined in the [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] with an [[Attribute Relationship>>doc:sdmx:Glossary.Attribute relationship.WebHome]] to the [[Dimension>>doc:sdmx:Glossary.Dimension.WebHome]] Group. This [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] is NOT defined as having an [[Attribute Relationship>>doc:sdmx:Glossary.Attribute relationship.WebHome]] to the Group.
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20 === 9.2.2 Structural Metadata ===
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22 If the conditions defined in 9.2.1are true then on conversion to a version 2.0 or 1.0 [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] (Key Family) the [[Component>>doc:sdmx:Glossary.Component.WebHome]]/[[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]].attachmentLevel must be set to “Group” and the [[Component>>doc:sdmx:Glossary.Component.WebHome]]/[[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]]/AttachmentGroup” is used to identify the Group. Note that under rule(1) in 1.2.1 this group will have been defined in the V 2.1 [[DSD>>doc:sdmx:Glossary.Data structure definition.WebHome]] and so will be present in the V 2.0 transformation.
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24 === 9.2.3 Data ===
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26 If the conditions defined in 9.2.1are true then, on conversion from a 2.1 [[data set>>doc:sdmx:Glossary.Data set.WebHome]] to a 2.0 or 1.0 [[dataset>>doc:sdmx:Glossary.Data set.WebHome]] the [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] value will be placed in the relevant . If these conditions are not true then the [[attribute>>doc:sdmx:Glossary.Attribute.WebHome]] value will be placed in the .
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28 === 9.2.4 Compact Schema ===
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30 If the conditions defined in 9.2.1are true then the Compact Schema must be generated with the Group present and the [[Attribute>>doc:sdmx:Glossary.Attribute.WebHome]](s) present in that group definition.