|
Catalog Metadata
*** indicates that predicate is not defined when its URI is resolved - as of 1 October 2011)
Name |
Cardinality |
Type |
Description |
dcterms:title (Title) |
1 |
Literal |
Name of the catalog |
foaf:homepage (URL) |
1 |
URI resource |
URL of the web page for accessing the catalog. Unique identifier for a catalog |
dcterms:description (Description) |
1 |
Literal |
Description of the catalog |
dgtwc:number_of_datasets (Number of Dataset) |
1 |
Integer |
Estimated number of datasets listed in the catalog |
dcterms:spatial (Spatial Region) |
0~1 |
URI resource |
The primary geographical region covered by all datasets in this catalog |
*** dgtwc:spatial_granularity (Spatial Region Type) |
0~1 |
Literal |
use the following value: Worldwide, National, State, City, ... |
dcterms:language (Language)* |
0~1 |
Literal |
The most frequently used language of the datasets listed in this catalog |
***dgtwc:tbl_rating (TBL's 5-star Rating)* |
0~1 |
Literal |
use: 1-downloadable; 2-structured; 3-open-format; 4-rdf; 5-linked-data |
|
Dataset Metadata: |
Name |
Cardinality |
Type |
Description |
dcterms:title (Title) |
0~1 |
Literal |
Name of the dataset |
foaf:homepage (URL) |
0~1 |
URI Resource |
URL of the web page for accessing the dataset. Unique identifier for a dataset |
dcterms:identifier (ID) * |
0~1 |
Literal |
Unique string ID of the dataset |
dcterms:description (Description) |
0~1 |
Literal |
Description of the dataset |
dcterms:download_format (Format) |
0~many |
Literal |
Available formats of the dataset |
foaf:page {a foaf:Document; dcterms:format ..} |
0~many |
Resource |
linking a dataset for web URLs where users can download/access the raw data. |
***dgtwc:category (Category) |
0~many |
Literal |
The original category (asserted by the catalog) of this dataset |
***dgtwc:categories (All Categories) |
0~1 |
Literal |
All categories (asserted by the catalog) of this dataset |
dcterms:subject (Keyword) |
0~many |
Literal |
The original keywords (asserted by the catalog) of this dataset |
***dgtwc:keywords (All keywords) |
0~1 |
Literal |
All keywords (or tags) of this dataset |
dcterms:language (Language)* |
0~1 |
Literal |
Language used by the text cells in the dataset |
dcterms:dateSubmitted (Date-Released)* |
0~1 |
Literal |
The date the dataset is released. |
***dgtwc:agency (Agency) |
0~1 |
URI Resource |
The actual publisher (typically a government agency) who curates and publishes the dataset |
***dgtwc:catalog_title (Catalog Title) ** |
1 |
Literal |
The government website (Country/State/City/Organization) which owns the dataset catalog that lists this dataset |
***dgtwc:catalog_homepage (Catalog URL) ** |
1 |
URI Resource |
URL of the web page of the dataset catalog that lists this dataset. Unique identifier for a catalog |
***dgtwc:catalog_subtitle (Catalog SubTitle) ** |
1 |
Literal |
for Data.gov's three sub-catalogs, namely Raw Data Catalog, Tool Catalog, and Geodata Catalog |
***dgtwc:catalog_country ** |
1 |
Literal |
The country of the owner of the dataset catalog. Strong indicator of the sptial region covered by the listed datasets. |
sample sparql query 1, users should expect to only query conversion:MetaDataset
# list 50 international datasets (please execute it at http://logd.tw.rpi.edu/sparql)
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX dcterms: <http://purl.org/dc/terms/>
PREFIX dgtwc: <http://data-gov.tw.rpi.edu/2009/data-gov-twc.rdf#>
#SELECT ?dataset_title ?dataset_homepage ?catalog_title ?catalog_subtitle ?dataset_categories ?dataset_agency
SELECT *
WHERE {
GRAPH <http://purl.org/twc/vocab/conversion/MetaDataset> {
_:dataset dcterms:title ?dataset_title .
_:dataset dcterms:isReferencedBy _:catalog_version .
OPTIONAL { _:dataset dcterms:description ?dataset_description. }
OPTIONAL { _:dataset foaf:homepage ?dataset_homepage . }
OPTIONAL { _:dataset dgtwc:categories ?dataset_categories. }
OPTIONAL { _:dataset dgtwc:agency [ rdfs:label ?dataset_agency ]. }
_:catalog_version void:subset [ dgtwc:catalog_title ?catalog_title ;
dgtwc:catalog_homepage ?catalog_homepage ;
dgtwc:catalog_country ?catalog_country ].
OPTIONAL { _:dataset dgtwc:catalog_subtitle ?catalog_subtitle . }
OPTIONAL { _:dataset dgtwc:category ?dataset_category. }
OPTIONAL { {_:dataset dgtwc:download_format ?download_format.}
UNION
{ _:dataset foaf:page _:file. _:file dcterms:format ?download_format.}
}
}
}
limit 50
note: for keyword search, you may compose query over: dcterms:description, dcterms:title, dgtwc:category, dcterms:subject