Package org.eclipse.rdf4j.rio.hdt
package org.eclipse.rdf4j.rio.hdt
Parser/writer for the HDT v1.0 format.
Unfortunately the draft specification is not entirely clear and probably slightly out of date, since the open source
reference implementation HDT-It seems to implement a slightly different version. This parser tries to be compatible
with HDT-It 1.0.
File structure:
+---------------------+ | Global | | Header | | Dictionary (Shared) | | Dictionary (S) | | Dictionary (P) | | Dictionary (O) | | Triples | +---------------------+
General structure for Global, Header, Dictionary and Triples
These part all starts with$HDT
, followed by a byte indicating the type of the part, the format, and
optionally one or more key=value;
properties.
Then a NULL
byte, followed by the 16-bit CRC ($HDT
and NULL
included)
+------+------+--------+------+------------+------+-------+ | $HDT | type | format | NULL | key=value; | NULL | CRC16 | +------+------+--------+------+------------+------+-------+The
format
varies slightly: depending on the section, it can either be a string or a URI.-
ClassDescriptionRDF parser for HDT v1.0 files.An
RDFParserFactory
for HDT parsers.Variable byte encoding for numbers.