Name
DB.DBA.TTLP — parses TTL (TURTLE or N3 resource) and places its triples into DB.DBA.RDF_QUAD.
Synopsis
DB.DBA.TTLP ( |
in strg any , |
| in base varchar , | |
| in graph varchar , | |
in flags integer
); |
Description
Parses TTL (TURTLE or N3 resource) and places its triples into DB.DBA.RDF_QUAD.
Parameters
strg
text of the resource
base
base IRI to resolve relative IRIs to absolute
graph
target graph IRI, parsed triples will appear in that graph.
flags
bitmask of parsing flags. Permits some sorts of syntax errors in resource. Default is 0, meaning no permitted deviations from the spec. Other supported bits are:
1 - Single quoted and double quoted strings may with newlines.
2 - Allows bnode predicates (but SPARQL processor may ignore them!).
4 - Allows variables, but triples with variables are ignored.
8 - Allows literal subjects, but triples with them are ignored.
16 - Allows '/', '#', '%' and '+' in local part of QName ("Qname with path")
32 - Allows invalid symbols between '<' and '>', i.e. in relative IRIs.
64 - Relax TURTLE syntax to include popular violations.
128 - Try to recover from lexical errors as much as it is possible.
256 - Allows TriG syntax, thus loading data in more than one graph.
512 - Allows loading N-quad dataset files with and optional context value to indicate provenance as detailed.
8192 - Enables searching for Turtle within the string.
<ulink url="http://sw.deri.org/2008/07/n-quads/">here</ulink>.
Return Types
The return value is not specified and may be changed in future versions.
Examples
Example24.266.
For loading a file of any greater length, it is most practical to use the file_to_string_output function.
It is important the file to be accessible for the Virtuoso server. You need to have set properly the DirsAllowed parameter value in section [Parameters] of the Virtuoso database INI file. For example on Windows it could be:
virtuoso.ini file: [Parameters] ... DirsAllowed = .\tmp ...
So in the example the file you want to import from, should be in the tmp folder or in its subfolder. Note that this example folder is a subfolder of the Virtuoso Server working directory.
Sample Example 1
SQL> ttlp (file_to_string_output ('.\tmp\data.ttl'), '', 'http://my_graph', 0);
Forth item in record of NQuad format is optional. If present then it is used as a graph. If missed then the default graph is used. The purpose is to make SPARQL dataset serialization possible in a "natural" way: the content of default graph is written without any graph name specified whereas the content of named graphs is written with fouth field in place. Similarly, TriG uses default graph for triples outside graph blocks. In all these cases, base IRI is used to resolve all relative IRIs of the document, no matter what is the destination graph. Here is a simple example:
Sample Example 2 Suppose we have the simple nquad.nq file:
<http://www.w3.org/2002/01/tr-automation/tr.rdf> <http://purl.org/dc/elements/1.1/title> "W3C Standards and Technical Reports" <http://www.w3.org/People/Berners-Lee/card> . <http://www.w3.org/People/Berners-Lee/card> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/PersonalProfileDocument> <http://www.w3.org/People/Berners-Lee/card> . <http://www.w3.org/People/Berners-Lee/card> <http://creativecommons.org/ns#license> <http://creativecommons.org/licenses/by-nc/3.0/> <http://www.w3.org/People/Berners-Lee/card> . <http://www.w3.org/People/Berners-Lee/card> <http://purl.org/dc/elements/1.1/title> "Tim Berners-Lee's FOAF file" <http://www.w3.org/People/Berners-Lee/card> . <http://www.w3.org/People/Berners-Lee/card> <http://xmlns.com/foaf/0.1/maker> <http://www.w3.org/People/Berners-Lee/card#i> <http://www.w3.org/People/Berners-Lee/card> . <http://www.w3.org/People/Berners-Lee/card> <http://xmlns.com/foaf/0.1/primaryTopic> <http://www.w3.org/People/Berners-Lee/card#i> <http://www.w3.org/People/Berners-Lee/card> . <http://www.w3.org/People/Berners-Lee/card#cm> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> <http://www.w3.org/People/Berners-Lee/card> . <http://www.w3.org/People/Berners-Lee/card#cm> <http://www.w3.org/2000/01/rdf-schema#seeAlso> <http://www.koalie.net/foaf.rdf> <http://www.w3.org/People/Berners-Lee/card> . <http://www.w3.org/People/Berners-Lee/card#cm> <http://xmlns.com/foaf/0.1/mbox> <mailto:coralie@w3.org> <http://www.w3.org/People/Berners-Lee/card> . <http://www.w3.org/People/Berners-Lee/card#cm> <http://xmlns.com/foaf/0.1/name> "Coralie Mercier" <http://www.w3.org/People/Berners-Lee/card> .
Load the file:
SQL>DB.DBA.TTLP (file_to_string_output ('./nquad.nq'), '', 'http://example.com/DAV/test', 512);
Done. -- 48 msec.
Select all triples from the graph with URI the fourth provenance URI from the NQuad file i.e.: <http://www.w3.org/People/Berners-Lee/card>:
SQL> sparql select * from <http://www.w3.org/People/Berners-Lee/card> where {?s ?p ?o};
s p o
VARCHAR VARCHAR VARCHAR
________________________________________________
http://www.w3.org/2002/01/tr-automation/tr.rdf http://purl.org/dc/elements/1.1/title W3C Standards and Technical Reports
http://www.w3.org/People/Berners-Lee/card http://www.w3.org/1999/02/22-rdf-syntax-ns#type http://xmlns.com/foaf/0.1/PersonalProfileDocument
http://www.w3.org/People/Berners-Lee/card http://xmlns.com/foaf/0.1/primaryTopic http://www.w3.org/People/Berners-Lee/card#i
http://www.w3.org/People/Berners-Lee/card http://purl.org/dc/elements/1.1/title Tim Berners-Lee's FOAF file
http://www.w3.org/People/Berners-Lee/card http://xmlns.com/foaf/0.1/maker http://www.w3.org/People/Berners-Lee/card#i
http://www.w3.org/People/Berners-Lee/card http://creativecommons.org/ns#license http://creativecommons.org/licenses/by-nc/3.0/
http://www.w3.org/People/Berners-Lee/card#cm http://www.w3.org/1999/02/22-rdf-syntax-ns#type http://xmlns.com/foaf/0.1/Person
http://www.w3.org/People/Berners-Lee/card#cm http://xmlns.com/foaf/0.1/mbox mailto:coralie@w3.org
http://www.w3.org/People/Berners-Lee/card#cm http://xmlns.com/foaf/0.1/name Coralie Mercier
http://www.w3.org/People/Berners-Lee/card#cm http://www.w3.org/2000/01/rdf-schema#seeAlso http://www.koalie.net/foaf.rdf
10 Rows. -- 7 msec.