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
The terms cito:cites
, cito:citesAsRelated
, cito:citesForEvidence
, and
cito:citesForInformation
are used to identify works cited and their
context.
Dublin Core
Every content item in Pleiades has a dc:title
, dc:description
,
dc:creator
, and one or more dc:contributor
.
FOAF
All content creators and contributors are foaf:Person
.
GeoVocab
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
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.