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4 4  
5 5  == 5.1 Introduction ==
6 6  
7 -The DataStructureDefiniton is the class name for a structure definition for data. Some organisations know this type of definition as a “Key Family” and so the two names are synonymous. The term Data Structure Definition (also referred to as DSD) is used in this specification.
7 +The DataStructureDefiniton is the class name for a structure definition for data. Some organisations know this type of definition as a “Key Family” and so the two names are synonymous. The term [[Data Structure Definition>>doc:xwiki:Glossary.Data structure definition.WebHome]] (also referred to as [[DSD>>doc:xwiki:Glossary.Data structure definition.WebHome]]) is used in this specification.
8 8  
9 -Many of the constructs in this layer of the model inherit from the SDMX Base Layer. Therefore, it is necessary to study both the inheritance and the relationship diagrams to understand the functionality of individual packages. In simple sub models these are shown in the same diagram but are omitted from the more complex sub models for the sake of clarity. In these cases, the inheritance diagram below shows the full inheritance tree for the classes concerned with data structure definitions.
9 +Many of the constructs in this layer of the model inherit from the [[SDMX>>doc:xwiki:Glossary.Statistical data and metadata exchange.WebHome]] Base Layer. Therefore, it is necessary to study both the inheritance and the relationship diagrams to understand the functionality of individual packages. In simple sub models these are shown in the same diagram but are omitted from the more complex sub models for the sake of clarity. In these cases, the inheritance diagram below shows the full inheritance tree for the classes concerned with data structure definitions.
10 10  
11 -There are very few additional classes in this sub model other than those shown in the inheritance diagram below. In other words, the SDMX Base gives most of the structure of this sub model both in terms of associations and in terms of attributes. The relationship diagrams shown in this section show clearly when these associations are inherited from the SDMX Base (see the Appendix “A Short Guide to UML in the SDMX Information Model” to see the diagrammatic notation used to depict this).
11 +There are very few additional classes in this sub model other than those shown in the inheritance diagram below. In other words, the [[SDMX>>doc:xwiki:Glossary.Statistical data and metadata exchange.WebHome]] Base gives most of the structure of this sub model both in terms of associations and in terms of [[attributes>>doc:xwiki:Glossary.Attribute.WebHome]]. The relationship diagrams shown in this section show clearly when these associations are inherited from the [[SDMX>>doc:xwiki:Glossary.Statistical data and metadata exchange.WebHome]] Base (see the Appendix “A Short Guide to UML in the [[SDMX Information Model>>doc:xwiki:Glossary.SDMX Information Model.WebHome]]” to see the diagrammatic notation used to depict this).
12 12  
13 -The actual SDMX Base construct from which the concrete classes inherit depends upon the requirements of the class for:
13 +The actual [[SDMX>>doc:xwiki:Glossary.Statistical data and metadata exchange.WebHome]] Base construct from which the concrete classes inherit depends upon the requirements of the class for:
14 14  
15 -Annotation – //AnnotableArtefact//
15 +[[Annotation>>doc:xwiki:Glossary.Annotation.WebHome]] – //AnnotableArtefact//
16 16  Identification – //IdentifiableArtefact//
17 17  Naming – //NameableArtefact//
18 18  Versioning – //VersionableArtefact//
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30 30  
31 31  ==== 5.2.2.1 Narrative ====
32 32  
33 -Those classes in the SDMX metamodel which require annotations inherit from //AnnotableArtefact//. These are:
33 +Those classes in the [[SDMX>>doc:xwiki:Glossary.Statistical data and metadata exchange.WebHome]] metamodel which require [[annotations>>doc:xwiki:Glossary.Annotation.WebHome]] inherit from //AnnotableArtefact//. These are:
34 34  
35 35  //IdentifiableArtefact
36 -DataSet
36 +[[DataSet>>doc:xwiki:Glossary.Data set.WebHome]]
37 37  Key// (and therefore //SeriesKey// and //GroupKey//)
38 38  //Observation//
39 39  
40 -Those classes in the SDMX metamodel which require annotations and global identity are derived from //IdentifiableArtefact//. These are:
40 +Those classes in the [[SDMX>>doc:xwiki:Glossary.Statistical data and metadata exchange.WebHome]] metamodel which require [[annotations>>doc:xwiki:Glossary.Annotation.WebHome]] and global identity are derived from //IdentifiableArtefact//. These are:
41 41  
42 42  //NameableArtefact
43 43  ComponentList
44 -Component//
44 +[[Component>>doc:xwiki:Glossary.Component.WebHome]]//
45 45  
46 -Those classes in the SDMX metamodel which require annotations, global identity, multilingual name and multilingual description are derived from //NameableArtefact//. These are:
46 +Those classes in the [[SDMX>>doc:xwiki:Glossary.Statistical data and metadata exchange.WebHome]] metamodel which require [[annotations>>doc:xwiki:Glossary.Annotation.WebHome]], global identity, multilingual name and multilingual description are derived from //NameableArtefact//. These are:
47 47  
48 48  //VersionableArtefact
49 49  Item//
50 50  
51 -The classes in the SDMX metamodel which require annotations, global identity, multilingual name and multilingual description, and versioning are derived from //VersionableArtefact//. These are:
51 +The classes in the [[SDMX>>doc:xwiki:Glossary.Statistical data and metadata exchange.WebHome]] metamodel which require [[annotations>>doc:xwiki:Glossary.Annotation.WebHome]], global identity, multilingual name and multilingual description, and versioning are derived from //VersionableArtefact//. These are:
52 52  
53 53  //MaintainableArtefact//
54 54  
55 -Abstract classes which represent information that is maintained by Maintenance Agencies all inherit from //MaintainableArtefact//, they also inherit all the features of a //VersionableArtefact//, and are:
55 +Abstract classes which represent information that is maintained by [[Maintenance Agencies>>doc:xwiki:Glossary.Maintenance agency.WebHome]] all inherit from //MaintainableArtefact//, they also inherit all the features of a //VersionableArtefact//, and are:
56 56  
57 57  //StructureUsage
58 58  Structure
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60 60  
61 61  All the above classes are abstract. The key to understanding the class diagrams presented in this section are the concrete classes that inherit from these abstract classes.
62 62  
63 -Those concrete classes in the SDMX Data Structure Definition and Dataset packages of the metamodel which require to be maintained by Agencies all inherit (via other abstract classes) from //MaintainableArtefact//, these are:
63 +Those concrete classes in the [[SDMX>>doc:xwiki:Glossary.Statistical data and metadata exchange.WebHome]] [[Data Structure Definition>>doc:xwiki:Glossary.Data structure definition.WebHome]] and [[Dataset>>doc:xwiki:Glossary.Data set.WebHome]] packages of the metamodel which require to be maintained by Agencies all inherit (via other abstract classes) from //MaintainableArtefact//, these are:
64 64  
65 65  Dataflow
66 66  DataStructureDefinition
67 67  
68 -The component structures that are lists of lists, inherit directly from //Structure//. A //Structure// contains several lists of components. The concrete class that inherits from //Structure// is:
68 +The [[component>>doc:xwiki:Glossary.Component.WebHome]] structures that are lists of lists, inherit directly from //Structure//. A //Structure// contains several lists of [[components>>doc:xwiki:Glossary.Component.WebHome]]. The concrete class that inherits from //Structure// is:
69 69  
70 70  DataStructureDefinition
71 71  
72 -A DataStructureDefinition contains a list of dimensions, a list of measures and a list of attributes.
72 +A DataStructureDefinition contains a list of [[dimensions>>doc:xwiki:Glossary.Dimension.WebHome]], a list of [[measures>>doc:xwiki:Glossary.Measure.WebHome]] and a list of attributes.
73 73  
74 74  The concrete classes which inherit from //ComponentList// and are subcomponents of the DataStructureDefinition are:
75 75  
76 -DimensionDescriptor – content is Dimension and TimeDimension
77 -DimensionGroupDescriptor – content is an association to Dimension, TimeDimension
76 +DimensionDescriptor – content is [[Dimension>>doc:xwiki:Glossary.Dimension.WebHome]] and TimeDimension
77 +DimensionGroupDescriptor – content is an association to [[Dimension>>doc:xwiki:Glossary.Dimension.WebHome]], TimeDimension
78 78  MeasureDescriptor – content is Measure
79 79  AttributeDescriptor – content is DataAttribute and an association to MetadataAttribute
80 80  
81 -The classes that inherit from //Component// are:
81 +The classes that inherit from //[[Component>>doc:xwiki:Glossary.Component.WebHome]]// are:
82 82  
83 83  Measure
84 84  
85 -//DimensionComponent// and thereby its sub classes of Dimension and TimeDimension
85 +//DimensionComponent// and thereby its sub classes of [[Dimension>>doc:xwiki:Glossary.Dimension.WebHome]] and TimeDimension
86 86  //Attribute// and thereby its sub classes of DataAttribute and MetadataAttribute
87 87  
88 88  The concrete classes identified above are the majority of the classes required to define the metamodel for the DataStructureDefinition. The diagrams and explanations in the rest of this section show how these concrete classes are related in order to support the functionality required.