Jena assembler quickstart
Jena's assembler provides a means of constructing Jena models according to a recipe, where that recipe is itself stated in RDF. This is the Assembler quickstart page. For more detailed information, see the Assembler howto or Inside assemblers.
What is an Assembler specification?
An Assembler specification is an RDF description of how to
construct a model and its associated resources, such as reasoners,
prefix mappings, and initial content. The Assembler vocabulary is
given in the Assembler schema,
and we'll use the prefix
ja for its identifiers.
What is an Assembler?
An Assembler is an object that implements the
interface and can construct objects (typically models) from
Assembler specifications. The constant
Assembler.general is an
Assembler that knows how to construct some general patterns
of model specification.
How can I make a model according to a specification?
Suppose the Model
M contains an Assembler specification whose
root - the Resource describing the whole Model to construct is
R.getModel() == M). Invoke:
The result is the desired Model. Further details about the
Assembler interface, the special Assembler
general, and the
details of specific Assemblers, are deferred to the
How can I specify ...
In the remaining sections, the object we want to describe is given
the root resource
... a memory model?
my:root a ja:MemoryModel.
... an inference model?
my:root ja:reasoner [ja:reasonerURL theReasonerURL] ; ja:baseModel theBaseModelResource .
theReasonerURL is one of the reasoner (factory) URLs given in the inference documentation and code; theBaseModelResource is another resource in the same document describing the base model.
... some initialising content?
my:root ja:content [ja:externalContent <someContentURL>] ... rest of model specification ... .
The model will be pre-loaded with the contents of someContentURL.
... an ontology model?
my:root ja:ontModelSpec ja:OntModelSpecName ; ja:baseModel somebaseModel .
The OntModelSpecName can be any of the predefined Jena
OntModelSpec names, eg
OWL_DL_MEM_RULE_INF. The baseModel is
another model description - it can be left out, in which case you
get an empty memory model. See
Assembler howto for construction of