ontospy 1.6.1

A Python project for working with RDF/OWL ontologies

RDFLIb-based Python toolkit for inspecting ontologies on the Semantic Web.

Description

OntoSPy allows you to extract all the schema information from an RDFS/OWL or SKOS vocabulary (aka an ‘ontology’) and navigate it using an interactive text-based interface.

OntoSPy is a lightweight command line tool for inspecting and understanding semantic web schemas without having to load a full-blown ontology editor like Protege. It offers no ontology editing functionalities, nor it can be used to interrogate a corresponding knowledge base (eg a triplestore - although the Python library could be easily extended to do that).

The basic workflow is simple: load a graph instantiating the Graph class; you get back an object that lets you interrogate the RDF schema. That’s all!

The library can be used in standalone mode too, via the ontospy-shell command.

See also: - documentation: http://ontospy.readthedocs.org/en/latest/ - source: https://github.com/lambdamusic/OntoSPy

Version

1.6 (Oct 2016)

Check the ontospy/_version.py file for more details.

Example

Import OntoSPy and instantiate the Graph object with the FOAF ontology:

In [1]: from ontospy import ontospy

In [2]: g = ontospy.Graph("http://xmlns.com/foaf/spec/20100809.rdf")
----------
Loaded 631 triples from <http://xmlns.com/foaf/spec/20100809.rdf>
started scanning...
----------
Ontologies found: 1
Classes found...: 14
Properties found: 67
Annotation......: 7
Datatype........: 26
Object..........: 34

In [3]: g.toplayer
Out[3]:
[<Class *http://www.w3.org/2003/01/geo/wgs84_pos#SpatialThing*>,
 <Class *http://xmlns.com/foaf/0.1/Agent*>,
 <Class *http://xmlns.com/foaf/0.1/Document*>,
 <Class *http://xmlns.com/foaf/0.1/LabelProperty*>,
 <Class *http://xmlns.com/foaf/0.1/OnlineAccount*>,
 <Class *http://xmlns.com/foaf/0.1/Project*>]


In [4]: g.printClassTree()
[1]   http://www.w3.org/2003/01/geo/wgs84_pos#SpatialThing
[12]  ----foaf:Person
[2]   foaf:Agent
[4]   ----foaf:Group
[11]  ----foaf:Organization
[12]  ----foaf:Person
[3]   foaf:Document
[5]   ----foaf:Image
[13]  ----foaf:PersonalProfileDocument
[6]   foaf:LabelProperty
[7]   foaf:OnlineAccount
[8]   ----foaf:OnlineChatAccount
[9]   ----foaf:OnlineEcommerceAccount
[10]  ----foaf:OnlineGamingAccount
[14]  foaf:Project

In [5]: doc = g.getClass(3)

In [6]: doc
Out[6]: <Class *http://xmlns.com/foaf/0.1/Document*>

In [7]: doc.describe()
Parents......: 0
Children.....: 2
Ancestors....: 0
Descendants..: 2
Domain of....: 3
Range of.....: 12
Instances....: 0
http://xmlns.com/foaf/0.1/Document
=> http://www.w3.org/2000/01/rdf-schema#comment
.... A document.
=> http://www.w3.org/2002/07/owl#disjointWith
.... http://xmlns.com/foaf/0.1/Project
=> http://www.w3.org/2000/01/rdf-schema#isDefinedBy
.... http://xmlns.com/foaf/0.1/
=> http://www.w3.org/2002/07/owl#disjointWith
.... http://xmlns.com/foaf/0.1/Organization
=> http://www.w3.org/2000/01/rdf-schema#label
.... Document
=> http://www.w3.org/2002/07/owl#equivalentClass
.... http://schema.org/CreativeWork
=> http://www.w3.org/2003/06/sw-vocab-status/ns#term_status
.... stable
=> http://www.w3.org/1999/02/22-rdf-syntax-ns#type
.... http://www.w3.org/2000/01/rdf-schema#Class
=> http://www.w3.org/1999/02/22-rdf-syntax-ns#type
.... http://www.w3.org/2002/07/owl#Class

In [8]: doc.descendants()
Out[8]:
[<Class *http://xmlns.com/foaf/0.1/Image*>,
 <Class *http://xmlns.com/foaf/0.1/PersonalProfileDocument*>]


In [9]: for c in doc.descendants():
                     c.describe()

Parents......: 1
Children.....: 0
Ancestors....: 1
Descendants..: 0
Domain of....: 2
Range of.....: 3
Instances....: 0
http://xmlns.com/foaf/0.1/Image
=> http://www.w3.org/2000/01/rdf-schema#comment
.... An image.
=> http://www.w3.org/2003/06/sw-vocab-status/ns#term_status
.... stable
=> http://www.w3.org/2002/07/owl#equivalentClass
.... http://schema.org/ImageObject
=> http://www.w3.org/2000/01/rdf-schema#subClassOf
.... http://xmlns.com/foaf/0.1/Document
=> http://www.w3.org/1999/02/22-rdf-syntax-ns#type
.... http://www.w3.org/2002/07/owl#Class
=> http://www.w3.org/1999/02/22-rdf-syntax-ns#type
.... http://www.w3.org/2000/01/rdf-schema#Class
=> http://www.w3.org/2000/01/rdf-schema#isDefinedBy
.... http://xmlns.com/foaf/0.1/
=> http://www.w3.org/2000/01/rdf-schema#label
.... Image
Parents......: 1
Children.....: 0
Ancestors....: 1
Descendants..: 0
Domain of....: 0
Range of.....: 0
Instances....: 0
http://xmlns.com/foaf/0.1/PersonalProfileDocument
=> http://www.w3.org/1999/02/22-rdf-syntax-ns#type
.... http://www.w3.org/2002/07/owl#Class
=> http://www.w3.org/2000/01/rdf-schema#label
.... PersonalProfileDocument
=> http://www.w3.org/2000/01/rdf-schema#subClassOf
.... http://xmlns.com/foaf/0.1/Document
=> http://www.w3.org/2003/06/sw-vocab-status/ns#term_status
.... testing
=> http://www.w3.org/1999/02/22-rdf-syntax-ns#type
.... http://www.w3.org/2000/01/rdf-schema#Class
=> http://www.w3.org/2000/01/rdf-schema#comment
.... A personal profile RDF document.