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Dave Beckett

 
 
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Rasqal RDF Query Library - Rasqal RDF parser utility

NAME

roqet − Rasqal RDF query utility

SYNOPSIS

roqet [OPTIONS] <query-URI> [base-URI]
roqet
[OPTIONS]-e query-string [base-URI]
roqet
[OPTIONS]-p sparql-protocol-service-URI [-e query-string ] [base-URI]
roqet
[OPTIONS]-t query results file [base-URI]

DESCRIPTION

The roqet utility allows querying of RDF content using the Rasqal RDF query library, printing the results for variable bindings, RDF graph or boolean results in a variety of formats. The query is read from query-URI and the optional base-URI is used as the base URI of the query if present.

MAIN OPTIONS

roqet uses the usual GNU command line syntax, with long options starting with two dashes (’-’) if supported by the getopt_long function. Otherwise only the short options are available.
−e, −−exec QUERY

Execute the query string in the argument QUERY instead of reading the query from a URI (when −e / −−exec is not given).

−i, −−input LANGUAGE

Set the input query LANGUAGE to one of the supported languages which includes ’sparql’ (SPARQL Query Language for RDF, default), ’sparql11’ and ’laqrs’. The full list of supported languages and subsets is given in the help summary with the −h / −−help option.

−p, −−protocol SERVICE-URI

Call the SPARQL HTTP protocol SERVICE-URI to execute the query instead of executing it inside the Rasqal query engine locally ( when -e is given, or a query string given)

−r, −−results FORMAT

Set the query results output FORMAT

For variable bindings, the values of FORMAT vary upon what Rasqal supports but include ’simple’ for a simple text format (default), ’xml’ for the SPARQL Query Results XML format, ’csv’ for SPARQL CSV, ’tsv’ for SPARQL TSV, ’rdfxml’ and ’turtle’ for RDF syntax formats, and ’json’ for a JSON version of the results.

For RDF graph results, the values of FORMAT are ’ntriples’ (N-Triples, default), ’rdfxml-abbrev’ (RDF/XML Abbreviated), ’rdfxml’ (RDF/XML), ’turtle’ (Turtle), ’json’ (RDF/JSON resource centric), ’json-triples’ (RDF/JSON triples) or ’rss-1.0’ (RSS 1.0, also an RDF/XML syntax).

The exact list of formats depends on what libraptor2(3) was built with but is given correct in the usage message with −h.

−R, −−results-input-format FORMAT

Set the query results input FORMAT

This is for use with −t and takes values of ’xml’ for the SPARQL Query Results XML format,, ’csv’ for SPARQL CSV,, ’tsv’ for SPARQL TSV, ’turtle’ and ’rdfxml’ for RDF syntax formats.

−t, −−results−input FILE

Read query results from FILE

OTHER OPTIONS

−c, −−count

Only count the triples and produce no other output.

−d, −−dump−query FORMAT

Print the parsed query out in a given FORMAT one of ’none’ (default), ’debug’, ’structure’ or ’sparql’

−D, −−data URI

Add RDF data source URI (not a named graph). If no data sources are given, the query itself must point to the data such as via SPARQL FROM uri statements.

−E, −−ignore−errors

Do not print error messages and do not exit with a non-0 status.

−f, −−feature NAME(=VALUE)

Set query feature NAME to the VALUE or integer 1 if omitted. The known features can be shown with -f help or --feature help.

−F, −−format NAME

Set the data source format name for subsequent data graphs called with −D / −−data or −G / −−named. The default if this is not specified is for the query engine to guess. The name is a Raptor parser name.

−G, −−named URI

Add RDF data source URI (named graph)

−h, −−help

Show a summary of the options.

−n, −−dryrun

Prepare the query but do not execute it.

−q, −−quiet

No extra information messages.

−s, −−source URI

Add RDF data source URI (named graph) URI by adding it to the list of query data source URIs. FORMAT to ’simple’ (default) or ’xml’ (an experimental XML format)

−v, −−version

Print the rasqal library version and exit.

−W, −−warnings LEVEL

Set the warning LEVEL in the range 0 (do not warn about anything) to 100 (show every warning). The Rasqal default is in the middle (50).

EXAMPLES

roqet sparql-query-file.rq

Run a SPARQL query contained in the local file sparql-query-file.rq. The data used would be described in FROM statements in the query file.

roqet -q -i sparql http://example.org/sparql-query.rq

Run a SPARQL query that is in the web at URI http://example.org/sparql-query.rq without an extra messages (quiet, -q).

roqet -q query-file.rq http://example.org/base/

Run an query (default languge SPARQL) from a local file query-file.rq but using base URI http://example.org/base/ to resolve any relative URIs.

roqet -q -i sparql -r xml http://example.org/sparql-query.rq

Run a SPARQL query that is in the web at URI http://example.org/sparql-query.rq and format the results in the SPARQL Query Results XML format with no extra messages.

roqet -i sparql -e ’SELECT * WHERE { ?s ?p ?o }’ -D stuff.rdf

Run a SPARQL query given on the command line against data in the file stuff.rdf. The type of the file will be guessed and likely is of format RDF/XML.

roqet -t result.srx -r html

Read a SPARQL query results in SPARQL Query Results XML format (default) and print it in HTML.

roqet -t result.ttl -R turtle -r csv

Read a SPARQL query results in RDF/Turtle format and print it in CSV.

CONFORMING TO

SPARQL 1.1 Query Language, Steve Harris and Andy Seaborne (eds), W3C Recommendation, 21 March 2013 http://www.w3.org/TR/2013/REC-sparql11-query-20130321/

SPARQL Query Results XML Format (Second Edition), Sandro Hawke (Second Edition ed), Jeen Broekstra and Dave Beckett (eds), W3C Recommendation, 21 March 2013. http://www.w3.org/TR/2013/REC-rdf-sparql-XMLres-20130321/

SEE ALSO

librasqal(3),libraptor(3)

CHANGES

AUTHOR

Dave Beckett - http://www.dajobe.org/