RDF from Pleiades
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README.rst

Pleiades RDF

This is the pleiades.rdf package. It provides RDF views of individual Pleiades places (such as http://pleiades.stoa.org/places/1043/turtle) and the comprehensive RDF dataset dumps at http://atlantides.org/downloads/pleiades/rdf/.

RDF Views of Places

The RDF views of Places (such as http://pleiades.stoa.org/places/1043/turtle for Turtle or http://pleiades.stoa.org/places/1043/rdf for RDF/XML) contain triples with the following classes of subjects:

  • Ancient World Places (real past world entities)
  • Authors – foaf:Person
  • Pleiades Places, Names, Locations – pleiades:Place, pleiades:Name, pleiades:Location
  • Pleiades vocabulary items – skos:Concept

Generally, every thing in the graph has at least a label, but detailed data is provided only for the Place at the center of the graph and its Locations and Names. The vocabularies used to express the detailed data are enumerated below.

RDF Dataset Dumps

The pleiades-latest.tar.gz archive contains 9 files of RDF for Places (places-[1-9].ttl), one file of RDF about erroneous Places (errata.ttl), a file describing Pleiades authors (authors.ttl), and two vocabularies (place-types.ttl and time-periods.ttl).

$ tar tzvf pleiades-latest.tar.gz
-rw-r--r-- zope/zope     14291 2013-04-02 18:11:12 authors.ttl
-rw-r--r-- zope/zope    262883 2013-04-02 18:14:34 errata.ttl
-rw-r--r-- zope/zope     17048 2013-04-02 18:12:00 place-types.ttl
-rw-r--r-- zope/zope  14708537 2013-04-02 18:52:35 places-1.ttl
-rw-r--r-- zope/zope  22835185 2013-04-02 20:28:42 places-2.ttl
-rw-r--r-- zope/zope  10463935 2013-04-02 21:21:32 places-3.ttl
-rw-r--r-- zope/zope  15205181 2013-04-02 22:32:57 places-4.ttl
-rw-r--r-- zope/zope  21944876 2013-04-03 00:36:33 places-5.ttl
-rw-r--r-- zope/zope  14548858 2013-04-03 02:00:07 places-6.ttl
-rw-r--r-- zope/zope   9114611 2013-04-03 03:07:33 places-7.ttl
-rw-r--r-- zope/zope  11176998 2013-04-03 04:12:06 places-8.ttl
-rw-r--r-- zope/zope   6685326 2013-04-03 04:28:29 places-9.ttl
-rw-r--r-- zope/zope     50855 2013-04-02 18:11:36 time-periods.ttl

These archives are created weekly. The difference between these files and the single Place graphs is that authors and vocabularies are represented separately and not duplicated within the batches of Places.

Vocabularies

Pleiades uses terms from several different vocabularies and ontologies.

Citation Ontology

http://purl.org/spar/cito/

The terms cito:cites, cito:citesAsRelated, cito:citesForEvidence, and cito:citesForInformation are used to identify works cited and their context.

Dublin Core

http://purl.org/dc/terms/

Every content item in Pleiades has a dc:title, dc:description, dc:creator, and one or more dc:contributor.

FOAF

http://xmlns.com/foaf/0.1/

All content creators and contributors are foaf:Person.

GeoVocab

http://geovocab.org/spatial#

Geographic connections are expressed using spatial:C.

Ordnance Survey Ontology

http://data.ordnancesurvey.co.uk/ontology/geometry/

http://data.ordnancesurvey.co.uk/ontology/spatialrelations/

The extents of spatial objects are expressed using osgeo:AbstractGeometry, osgeo:AsGeoJSON, and osgeo:AsWKT. Spatial overlap is expressed using osspatial:partiallyOverlaps.

OWL

http://www.w3.org/2002/07/owl#

The owl:sameAs property is used to identify the resolved duplicates within Pleiades.

Pleiades

http://pleiades.stoa.org/places/vocab#

The Pleiades RDF vocabulary consists of 3 classes: pleiades:Place, pleiades:Location, and pleiades:Name.

Instances of pleiades:Place identify their component Names and Locations with pleiades:hasName and pleiades:hasLocation.

All Names and Locations identify time periods during which they were in use with pleiades:during. The minimum attested year of the oldest and the maximum attested year of the most recent of these time periods are also provided using pleiades:start_date and pleiades:end_date.

Locations identify associated feature types with pleiades:hasFeatureType.

The attested form of a name in its original writing system is bound to the pleiades:nameAttested property, while its romanizations are bound to pleiades:nameRomanized.

SKOS Core

http://www.w3.org/2004/02/skos/core#

SKOS terms are used to describe the feature type and time period vocabularies of Pleiades.

RDF Schema

http://www.w3.org/2000/01/rdf-schema#

We try to give every thing in our graph a rdfs:label. Things of the ancient world – as opposed to their counterparts in the Pleiades site – have a rdfs:comment instead of dc:description. Pleiades also uses rdfs:seeAlso for links to Wikipedia, etc.

W3C Geographic Position

http://www.w3.org/2003/01/geo/wgs84_pos#

This is probably the most well known vocabulary for geographic location. The terms geo:lat and geo:long are used to help spatially naive systems get a grip on Pleiades data.

W3C Provenance

http://www.w3.org/TR/prov-o/#

The sources of all Pleiades content are identified using prov:wasDerivedFrom.

Classical Atlas Project Authors and Contributors

See the file pleiades/rdf/cap-authors.csv.