Concrete example of observations and datasets are as follows.
- Observation
- Dataset
- Information attached to datasets
- Measure
- Dimension
- Attribute
- Linkage to external vocabularies
- Structure of SSDS:System of Social and Demographic Statistics
Observation
Observation value, dimensions, etc. are defined for each observation. Additional attributes are also defined.
In case figure in small area or grid square is too small, the figure is concealed and added into the figure of neighboring area. Concealment information is defined in observations.
Dataset
Contents of statistical table are defined for each dataset.
Frequency, spatial coverage and temporal coverage are defined for each dataset other than basic properties such as title.
Catalog is also defined. Catalog correspons to government statistics and links to dataset in the government statistics.
Dataset structure are also defined. Measures and dimensions used in the datasete are defined in dataset structure.
As values of dimension which each dataset can have vary by dataset, the values are defined in dataset structure definition as a code list.
Information attached to datasets
Contents of statistical table have government statistics, categories, etc. and are defined with hierarchy.
Frequency of data is also defined.
In each dataset, "fields of statistics" in e-Stat is defined as theme. Theme has two layers.
Measure
Measures such as population, number of households, and amount of money are defined as original vocabularies. Data structure of measures is as follows. As for system of social and demographic statistics(SSDS), standard measure "http://purl.org/linked-data/sdmx/2009/measure#obsValue" is used.
Dimension
Dimensions identify the observations and are defined as original vocabularies.
Attribute
Unit of measure, unit multiplier, type of observation, and status of observation are defined as attributes. Attributes are attached to observations. Definition of unit of measure is illustrated as follows.
Linkage to external vocabularies
Vcabularies defined in statistical LOD of Japan are linked to statndard vocabularies or external institutes’ vocabularies.
Structure of SSDS:System of Social and Demographic Statistics
As for system of social and demographic statistics(SSDS), standard measure "http://purl.org/linked-data/sdmx/2009/measure#obsValue" is used. Dimension "indicator" is used to represent the phenomenon being observed.
In SSDS, as dimension "indicator" is used to represent the phenomenon being observed, unit is attached to the value of dimension "indicator".
SSDS is a system in which statistical data in a wide range of fields are collected, normalised and organised by prefectures and municipalities. Statistical LOD of Japan defines the original statistics for each indicator.
Prefix
| prefix | URI |
|---|---|
| rdfs | http://www.w3.org/2000/01/rdf-schema# |
| rdf | http://www.w3.org/1999/02/22-rdf-syntax-ns# |
| dcat | http://www.w3.org/ns/dcat# |
| skos | http://www.w3.org/2004/02/skos/core# |
| qb | http://purl.org/linked-data/cube# |
| sdmx-dimension | http://purl.org/linked-data/sdmx/2009/dimension# |
| sdmx-code | http://purl.org/linked-data/sdmx/2009/code# |
| dcterms | http://purl.org/dc/terms/ |
| cen | http://datiopen.istat.it/odi/ontologia/censimento/ |
| lod | http://data.e-stat.go.jp/lod/ |
| statistics | http://data.e-stat.go.jp/lod/statistics/ |
| govstat | http://data.e-stat.go.jp/lod/statistics/governmentStatistics/ |
| category | http://data.e-stat.go.jp/lod/statistics/category/ |
| category1 | http://data.e-stat.go.jp/lod/statistics/category1/ |
| table | http://data.e-stat.go.jp/lod/statistics/table/ |
| g00200521 | http://data.e-stat.go.jp/lod/dataset/g00200521/ |
| g00200502 | http://data.e-stat.go.jp/lod/dataset/g00200502/ |
| d0003041389 | http://data.e-stat.go.jp/lod/dataset/g00200521/d0003041389/ |
| d0003148541 | http://data.e-stat.go.jp/lod/dataset/g00200521/d0003148541/ |
| d0003041389-component | http://data.e-stat.go.jp/lod/dataset/g00200521/d0003041389/dsd/component/ |
| d0003148541-component | http://data.e-stat.go.jp/lod/dataset/g00200521/d0003148541/dsd/component/ |
| d0003148541-codeList | http://data.e-stat.go.jp/lod/dataset/g00200521/d0003148541/dsd/codeList/ |
| lod-table | http://data.e-stat.go.jp/lod/ontology/table/ |
| table-code | http://data.e-stat.go.jp/lod/ontology/table/code/ |
| d-prop | http://data.e-stat.go.jp/lod/ontology/dataset/property/ |
| d-theme | http://data.e-stat.go.jp/lod/ontology/dataset/theme/ |
| theme-field | http://data.e-stat.go.jp/lod/ontology/dataset/theme/field/ |
| prop-component | http://data.e-stat.go.jp/lod/ontology/property/component/ |
| prop-obs | http://data.e-stat.go.jp/lod/ontology/property/observation/ |
| estat-measure | http://data.e-stat.go.jp/lod/ontology/measure/ |
| estat-attribute | http://data.e-stat.go.jp/lod/ontology/attribute/ |
| estat-attribute-code | http://data.e-stat.go.jp/lod/ontology/attribute/code/ |
| cd-dimension | http://data.e-stat.go.jp/lod/ontology/crossDomain/dimension/ |
| cd-code | http://data.e-stat.go.jp/lod/ontology/crossDomain/code/ |
| g00200521-dimension-2010 | http://data.e-stat.go.jp/lod/ontology/g00200521/dimension/2010/ |
| g00200502-dimension | http://data.e-stat.go.jp/lod/ontology/g00200502/dimension/ |
| g00200502-code | http://data.e-stat.go.jp/lod/ontology/g00200502/code/ |
| g00200502-items | http://data.e-stat.go.jp/lod/ontology/descriptionOfItems/g00200502/items/ |
| sac | http://data.e-stat.go.jp/lod/sac/ |
| sa-g00200521-2015 | http://data.e-stat.go.jp/lod/smallArea/g00200521/2015/ |
