Changes for page SDMX 3.1 Standards. Section 1. Summary of Major Changes and New Functionality

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64	64	The changes to the information model support two distinct use cases:
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66		-1. Horizontally complex [[Data Structure Definitions>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]] (DSDs)
67		-1. Additional cohesion to the Data [[Constraints>>doc:sdmx:Glossary 2\.1.Constraint.WebHome]] model
	66	+1. Horizontally complex [[Data Structure Definitions>>doc:Glossary.Data structure definition.WebHome]] (DSDs)
	67	+1. Additional cohesion to the Data (% style="color:#e74c3c" %)[[Constraints>>doc:Glossary.Constraint.WebHome]](%%) model
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69	69	These changes are described in below.
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71	71	== 3.1 Horizontally Complex Data Structure Definitions ==
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73		-An explanation of this use case, with additional details can be found under Section 6 - Technical Notes, under heading ‘10.3 [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] [[Constraint>>doc:sdmx:Glossary 2\.1.Constraint.WebHome]]’.
	73	+An explanation of this use case, with additional details can be found under Section 6 - Technical Notes, under heading ‘10.3 [[Dimension>>doc:Glossary.Dimension.WebHome]] (% style="color:#e74c3c" %)[[Constraint>>doc:Glossary.Constraint.WebHome]](%%)’.
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75	75	The following changes to the model have been made to satisfy this use case.
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77	77	**Data Structure Definition**
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79		-The [[Data Structure Definition>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]] has a new ‘evolving structure’ property, this is a Boolean property, when set to ‘true’ it indicates to the users of the [[DSD>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]] that new [[Dimensions>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] may be added without the [[DSD>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]] undergoing a change to its major [[version>>doc:sdmx:Glossary 2\.1.Version.WebHome]] number.
	79	+The [[Data Structure Definition>>doc:Glossary.Data structure definition.WebHome]] has a new ‘evolving structure’ property, this is a Boolean property, when set to ‘true’ it indicates to the users of the [[DSD>>doc:Glossary.Data structure definition.WebHome]] that new [[Dimensions>>doc:Glossary.Dimension.WebHome]] may be added without the [[DSD>>doc:Glossary.Data structure definition.WebHome]] undergoing a change to its major (% style="color:#e74c3c" %)[[version>>doc:Glossary.Version.WebHome]](%%) number.
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81	81	**Dataflow**
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83		-The [[Dataflow>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]] has a new [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] [[Constraint>>doc:sdmx:Glossary 2\.1.Constraint.WebHome]] property, which is used to reference a subset of [[Dimensions>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] which it uses from the referenced [[DSD>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]].
	83	+The [[Dataflow>>doc:Glossary.Dataflow.WebHome]] has a new [[Dimension>>doc:Glossary.Dimension.WebHome]] (% style="color:#e74c3c" %)[[Constraint>>doc:Glossary.Constraint.WebHome]](%%) property, which is used to reference a subset of [[Dimensions>>doc:Glossary.Dimension.WebHome]] which it uses from the referenced [[DSD>>doc:Glossary.Data structure definition.WebHome]].
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85		-The [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] [[Constraint>>doc:sdmx:Glossary 2\.1.Constraint.WebHome]] fixes the [[Dimensions>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] of the [[Dataflow>>doc:sdmx:Glossary 2\.1.Dataflow.WebHome]] enabling the referenced [[DSD>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]] to have new [[Dimensions>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] added without the need to change the major [[version>>doc:sdmx:Glossary 2\.1.Version.WebHome]] number.
	85	+The [[Dimension>>doc:Glossary.Dimension.WebHome]] (% style="color:#e74c3c" %)[[Constraint>>doc:Glossary.Constraint.WebHome]](%%) fixes the [[Dimensions>>doc:Glossary.Dimension.WebHome]] of the [[Dataflow>>doc:Glossary.Dataflow.WebHome]] enabling the referenced [[DSD>>doc:Glossary.Data structure definition.WebHome]] to have new [[Dimensions>>doc:Glossary.Dimension.WebHome]] added without the need to change the major (% style="color:#e74c3c" %)[[version>>doc:Glossary.Version.WebHome]](%%) number.
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87		-The [[Dimension>>doc:sdmx:Glossary 2\.1.Dimension.WebHome]] [[Constraint>>doc:sdmx:Glossary 2\.1.Constraint.WebHome]] property is only required if the [[DSD>>doc:sdmx:Glossary 2\.1.Data structure definition.WebHome]] sets the evolving structure property to true.
	87	+The [[Dimension>>doc:Glossary.Dimension.WebHome]] (% style="color:#e74c3c" %)[[Constraint>>doc:Glossary.Constraint.WebHome]](%%) property is only required if the [[DSD>>doc:Glossary.Data structure definition.WebHome]] sets the evolving structure property to true.
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89	89	== 3.2 Constraint Cohesion ==
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