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.
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.
An Assembler is an object that implements the Assembler
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.
Suppose the Model M
contains an Assembler specification whose
root - the Resource describing the whole Model to construct is
R
(so R.getModel() == M)
. Invoke:
Assembler.general.openModel(R)
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
Assembler howto.
In the remaining sections, the object we want to describe is given
the root resource my:root
.
my:root a ja:MemoryModel.
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.
my:root ja:content [ja:externalContent <someContentURL>] ... rest of model specification ... .
The model will be pre-loaded with the contents of someContentURL.
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
non-predefined OntModelSpecs.