Database Reference
In-Depth Information
Fig. 1.
The previous architecture of the LD Management System
exporting functionality is exposed which can handle a variety of LD formats,
such as RDF/XML, NTriples
15
, and Turtle
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.
LMS exposes the following methods:
-
ldquery:
It takes as input the SPARQL query as a String and optionally a time-
out and row limit parameters and returns the result in the format requested
by the user.
-
ldupdate:
Similarly to
ldquery
, this method takes as input a SPARUL (SPARQL
1.1 Update Language
17
) update statement (along with the same optional para-
meters) and applies/executes it.
-
addR2RMLMappings:
It takes as input the mapping specified as String in
R2RML (RDB to RDF Mapping Language
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), which is a W3C Recommen-
dation that aims at enabling the description of customized mappings between
a relational database and RDF datasets, as well as the name of the graph
to be created and initiates the relational-to-linked data mapping procedure
offered by Virtuoso Triple Store.
-
ldexport:
It exports either a complete graph or a set of statements, which
involve from zero to at most three URIs (pertaining to the URIs of subject,
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