Class RDFFormat

java.lang.Object

org.eclipse.rdf4j.common.lang.FileFormat

org.eclipse.rdf4j.rio.RDFFormat

public class RDFFormat
extends FileFormat

Represents the concept of an RDF data serialization format. RDF formats are identified by a name and can have one or more associated MIME types, zero or more associated file extensions and can specify a (default) character encoding. Some formats are able to encode context information while other are not; this is indicated by the value of supportsContexts.

Author:

Arjohn Kampman

Field Summary

Fields

Modifier and Type	Field	Description
static final RDFFormat	BINARY	A binary RDF format.
static final RDFFormat	HDT	The HDT file format, an RDF serialization format.
static final RDFFormat	JSONLD	The JSON-LD file format, an RDF serialization format that supports recording of named graphs.
static final RDFFormat	N3	The N3/Notation3 file format.
static final RDFFormat	NDJSONLD	The NDJSON-LD is a Newline Delimited JSON-LD format.
static final boolean	NO_CONTEXTS	Indicates that the Statement.getContext() URI will NOT be serialized for this format.
static final boolean	NO_NAMESPACES	Indicates that all calls to RDFHandler.handleNamespace(String, String) will be ignored when serializing to this format.
static final boolean	NO_RDF_STAR	Indicates that RDF-star triples will NOT be serialized natively for this format.
static final RDFFormat	NQUADS	The N-Quads file format, an RDF serialization format that supports recording of named graphs.
static final RDFFormat	NTRIPLES	The N-Triples file format.
static final RDFFormat	RDFA	The RDFa file format, an RDF serialization format.
static final RDFFormat	RDFJSON	The RDF/JSON file format, an RDF serialization format that supports recording of named graphs.
static final RDFFormat	RDFXML	The RDF/XML file format.
static final boolean	SUPPORTS_CONTEXTS	Indicates that the Statement.getContext() URI may be serialized for this format.
static final boolean	SUPPORTS_NAMESPACES	Indicates that calls to RDFHandler.handleNamespace(String, String) may be serialised when serializing to this format.
static final boolean	SUPPORTS_RDF_STAR	Indicates that RDF-star triples can be serialized natively for this format.
static final RDFFormat	TRIG	The TriG file format, a Turtle-based RDF serialization format that supports recording of named graphs.
static final RDFFormat	TRIGSTAR	The TriG-star file format, a TriG-based RDF serialization format that supports RDF-star triples.
static final RDFFormat	TRIX	The TriX file format, an XML-based RDF serialization format that supports recording of named graphs.
static final RDFFormat	TURTLE	The Turtle file format.
static final RDFFormat	TURTLESTAR	The Turtle-star file format, a Turtle-based RDF serialization format that supports RDF-star triples.

Constructor Summary

Constructors

Constructor	Description
RDFFormat(String name, String mimeType, Charset charset, String fileExtension, boolean supportsNamespaces, boolean supportsContexts)	Deprecated. since 3.2.0
RDFFormat(String name, String mimeType, Charset charset, String fileExtension, boolean supportsNamespaces, boolean supportsContexts, boolean supportsRDFStar)	Creates a new RDFFormat object.
RDFFormat(String name, String mimeType, Charset charset, Collection<String> fileExtensions, boolean supportsNamespaces, boolean supportsContexts)	Deprecated. since 3.2.0
RDFFormat(String name, String mimeType, Charset charset, Collection<String> fileExtensions, boolean supportsNamespaces, boolean supportsContexts, boolean supportsRDFStar)	Creates a new RDFFormat object.
RDFFormat(String name, Collection<String> mimeTypes, Charset charset, Collection<String> fileExtensions, boolean supportsNamespaces, boolean supportsContexts)	Deprecated. since 3.2.0
RDFFormat(String name, Collection<String> mimeTypes, Charset charset, Collection<String> fileExtensions, boolean supportsNamespaces, boolean supportsContexts, boolean supportsRDFStar)	Creates a new RDFFormat object.
RDFFormat(String name, Collection<String> mimeTypes, Charset charset, Collection<String> fileExtensions, IRI standardURI, boolean supportsNamespaces, boolean supportsContexts)	Deprecated. since 3.2.0
RDFFormat(String name, Collection<String> mimeTypes, Charset charset, Collection<String> fileExtensions, IRI standardURI, boolean supportsNamespaces, boolean supportsContexts, boolean supportsRDFStar)	Creates a new RDFFormat object.

Method Summary

Modifier and Type	Method	Description
static List<String>	getAcceptParams(Iterable<RDFFormat> rdfFormats, boolean requireContext, RDFFormat preferredFormat)	Processes the supplied collection of RDFFormats and assigns quality values to each based on whether context must be supported and whether the format is preferred.
IRI	getStandardURI()
boolean	hasStandardURI()
boolean	supportsContexts()	Return true if the RDFFormat supports the encoding of contexts/named graphs.
boolean	supportsNamespaces()	Return true if the RDFFormat supports the encoding of namespace/prefix information.
boolean	supportsRDFStar()	Return true if the RDFFormat supports the encoding of RDF-star triples natively.

Methods inherited from class org.eclipse.rdf4j.common.lang.FileFormat

equals, getCharset, getDefaultFileExtension, getDefaultMIMEType, getFileExtensions, getMIMETypes, getName, hasCharset, hasDefaultFileExtension, hasDefaultMIMEType, hasFileExtension, hashCode, hasMIMEType, matchFileName, matchMIMEType, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

SUPPORTS_NAMESPACES

public static final boolean SUPPORTS_NAMESPACES

Indicates that calls to RDFHandler.handleNamespace(String, String) may be serialised when serializing to this format.

See Also:

• Constant Field Values

NO_NAMESPACES

public static final boolean NO_NAMESPACES

Indicates that all calls to RDFHandler.handleNamespace(String, String) will be ignored when serializing to this format.

See Also:

• Constant Field Values

SUPPORTS_CONTEXTS

public static final boolean SUPPORTS_CONTEXTS

Indicates that the Statement.getContext() URI may be serialized for this format.

See Also:

• Constant Field Values

NO_CONTEXTS

public static final boolean NO_CONTEXTS

Indicates that the Statement.getContext() URI will NOT be serialized for this format.

See Also:

• Constant Field Values

SUPPORTS_RDF_STAR

public static final boolean SUPPORTS_RDF_STAR

Indicates that RDF-star triples can be serialized natively for this format.

See Also:

• Constant Field Values

NO_RDF_STAR

public static final boolean NO_RDF_STAR

Indicates that RDF-star triples will NOT be serialized natively for this format.

See Also:

• Constant Field Values

RDFXML

public static final RDFFormat RDFXML

The RDF/XML file format.

Several file extensions are accepted for RDF/XML documents, including .rdf, .rdfs (for RDF Schema files), .owl (for OWL ontologies), and .xml. The media type is application/rdf+xml, but application/xml and text/xml are also accepted. The character encoding is UTF-8.

See Also:

• RDF/XML Syntax Specification (Revised)

NTRIPLES

public static final RDFFormat NTRIPLES

The N-Triples file format.

The file extension .nt is recommend for N-Triples documents. The media type is application/n-triples and encoding is in UTF-8.

See Also:

• N-Triples

TURTLE

public static final RDFFormat TURTLE

The Turtle file format.

The file extension .ttl is recommend for Turtle documents. The media type is text/turtle, but application/x-turtle is also accepted. Character encoding is UTF-8.

See Also:

• Turtle - Terse RDF Triple Language

TURTLESTAR

public static final RDFFormat TURTLESTAR

The Turtle-star file format, a Turtle-based RDF serialization format that supports RDF-star triples.

The file extension .ttls is recommended for Turtle-star documents. The media type is application/x-turtlestar and the encoding is UTF-8.

See Also:

• Foundations of an Alternative Approach to Reification in RDF
• RDF-star and SPARQL-star Draft Community Group Report

N3

public static final RDFFormat N3

The N3/Notation3 file format.

The file extension .n3 is recommended for N3 documents. The media type is text/n3, but text/rdf+n3 is also accepted. Character encoding is UTF-8.

See Also:

• Notation3 (N3): A readable RDF syntax

TRIX

public static final RDFFormat TRIX

The TriX file format, an XML-based RDF serialization format that supports recording of named graphs.

The file extension .xml is recommended for TriX documents, .trix is also accepted. The media type is application/trix and the encoding is UTF-8.

See Also:

• TriX: RDF Triples in XML

TRIG

public static final RDFFormat TRIG

The TriG file format, a Turtle-based RDF serialization format that supports recording of named graphs.

The file extension .trig is recommend for TriG documents. The media type is application/trig and the encoding is UTF-8.

See Also:

• The TriG Syntax

TRIGSTAR

public static final RDFFormat TRIGSTAR

The TriG-star file format, a TriG-based RDF serialization format that supports RDF-star triples. This builds upon the idea for the Turtle-star format but adds support for named graphs.

The file extension .trigs is recommended for TriG-star documents. The media type is application/x-trigstar and the encoding is UTF-8.

See Also:

• Foundations of an Alternative Approach to Reification in RDF
• RDF-star and SPARQL-star Draft Community Group Report

BINARY

public static final RDFFormat BINARY

A binary RDF format.

The file extension .brf is recommend for binary RDF documents. The media type is application/x-binary-rdf.

See Also:

• Binary RDF in Sesame

NQUADS

public static final RDFFormat NQUADS

The N-Quads file format, an RDF serialization format that supports recording of named graphs.

The file extension .nq is recommended for N-Quads documents. The media type is application/n-quads and the encoding is UTF-8.

See Also:

• N-Quads: Extending N-Triples with Context

JSONLD

public static final RDFFormat JSONLD

The JSON-LD file format, an RDF serialization format that supports recording of named graphs.

The file extension .jsonld is recommended for JSON-LD documents. The media type is application/ld+json and the encoding is UTF-8.

See Also:

• JSON-LD 1.0

NDJSONLD

public static final RDFFormat NDJSONLD

The NDJSON-LD is a Newline Delimited JSON-LD format.

The file extension .ndjsonld is recommended for NDJSON-LD documents. The media type is application/x-ld+ndjson and the encoding is UTF-8.

RDFJSON

public static final RDFFormat RDFJSON

The RDF/JSON file format, an RDF serialization format that supports recording of named graphs.

The file extension .rj is recommended for RDF/JSON documents. The media type is application/rdf+json and the encoding is UTF-8.

See Also:

• RDF 1.1 JSON Alternate Serialization (RDF/JSON)

RDFA

public static final RDFFormat RDFA

The RDFa file format, an RDF serialization format.

The file extension .xhtml is recommended for RDFa documents. The preferred media type is application/xhtml+xml and the encoding is UTF-8.

See Also:

• XHTML+RDFa 1.1

HDT

public static final RDFFormat HDT

The HDT file format, an RDF serialization format.

The file extension .hdt is recommended for HDT documents.

See Also:

• HDT v1.0

Constructor Details

RDFFormat

@Deprecated(since="3.2.0")
public RDFFormat(String name,
 String mimeType,
 Charset charset,
 String fileExtension,
 boolean supportsNamespaces,
 boolean supportsContexts)

Deprecated.

since 3.2.0

Creates a new RDFFormat object.

Parameters:

name - The name of the RDF file format, e.g. "RDF/XML".

mimeType - The MIME type of the RDF file format, e.g. application/rdf+xml for the RDF/XML file format.

charset - The default character encoding of the RDF file format. Specify null if not applicable.

fileExtension - The (default) file extension for the RDF file format, e.g. rdf for RDF/XML files.

supportsNamespaces - True if the RDFFormat supports the encoding of namespace/prefix information and false otherwise.

supportsContexts - True if the RDFFormat supports the encoding of contexts/named graphs and false otherwise.

RDFFormat

public RDFFormat(String name,
 String mimeType,
 Charset charset,
 String fileExtension,
 boolean supportsNamespaces,
 boolean supportsContexts,
 boolean supportsRDFStar)

Creates a new RDFFormat object.

Parameters:

name - The name of the RDF file format, e.g. "RDF/XML".

mimeType - The MIME type of the RDF file format, e.g. application/rdf+xml for the RDF/XML file format.

charset - The default character encoding of the RDF file format. Specify null if not applicable.

fileExtension - The (default) file extension for the RDF file format, e.g. rdf for RDF/XML files.

supportsNamespaces - True if the RDFFormat supports the encoding of namespace/prefix information and false otherwise.

supportsContexts - True if the RDFFormat supports the encoding of contexts/named graphs and false otherwise.

supportsRDFStar - True if the RDFFormat supports the encoding of RDF-star triples natively and false otherwise.

RDFFormat

@Deprecated(since="3.2.0")
public RDFFormat(String name,
 String mimeType,
 Charset charset,
 Collection<String> fileExtensions,
 boolean supportsNamespaces,
 boolean supportsContexts)

Deprecated.

since 3.2.0

Creates a new RDFFormat object.

Parameters:

name - The name of the RDF file format, e.g. "RDF/XML".

mimeType - The MIME type of the RDF file format, e.g. application/rdf+xml for the RDF/XML file format.

charset - The default character encoding of the RDF file format. Specify null if not applicable.

fileExtensions - The RDF format's file extensions, e.g. rdf for RDF/XML files. The first item in the list is interpreted as the default file extension for the format.

supportsNamespaces - True if the RDFFormat supports the encoding of namespace/prefix information and false otherwise.

supportsContexts - True if the RDFFormat supports the encoding of contexts/named graphs and false otherwise.

RDFFormat

public RDFFormat(String name,
 String mimeType,
 Charset charset,
 Collection<String> fileExtensions,
 boolean supportsNamespaces,
 boolean supportsContexts,
 boolean supportsRDFStar)

Creates a new RDFFormat object.

Parameters:

name - The name of the RDF file format, e.g. "RDF/XML".

mimeType - The MIME type of the RDF file format, e.g. application/rdf+xml for the RDF/XML file format.

charset - The default character encoding of the RDF file format. Specify null if not applicable.

fileExtensions - The RDF format's file extensions, e.g. rdf for RDF/XML files. The first item in the list is interpreted as the default file extension for the format.

supportsNamespaces - True if the RDFFormat supports the encoding of namespace/prefix information and false otherwise.

supportsContexts - True if the RDFFormat supports the encoding of contexts/named graphs and false otherwise.

supportsRDFStar - True if the RDFFormat supports the encoding of RDF-star triples natively and false otherwise.

RDFFormat

@Deprecated(since="3.2.0")
public RDFFormat(String name,
 Collection<String> mimeTypes,
 Charset charset,
 Collection<String> fileExtensions,
 boolean supportsNamespaces,
 boolean supportsContexts)

Deprecated.

since 3.2.0

Creates a new RDFFormat object.

Parameters:

name - The name of the RDF file format, e.g. "RDF/XML".

mimeTypes - The MIME types of the RDF file format, e.g. application/rdf+xml for the RDF/XML file format. The first item in the list is interpreted as the default MIME type for the format.

charset - The default character encoding of the RDF file format. Specify null if not applicable.

fileExtensions - The RDF format's file extensions, e.g. rdf for RDF/XML files. The first item in the list is interpreted as the default file extension for the format.

supportsNamespaces - True if the RDFFormat supports the encoding of namespace/prefix information and false otherwise.

supportsContexts - True if the RDFFormat supports the encoding of contexts/named graphs and false otherwise.

RDFFormat

public RDFFormat(String name,
 Collection<String> mimeTypes,
 Charset charset,
 Collection<String> fileExtensions,
 boolean supportsNamespaces,
 boolean supportsContexts,
 boolean supportsRDFStar)

Creates a new RDFFormat object.

Parameters:

name - The name of the RDF file format, e.g. "RDF/XML".

mimeTypes - The MIME types of the RDF file format, e.g. application/rdf+xml for the RDF/XML file format. The first item in the list is interpreted as the default MIME type for the format.

charset - The default character encoding of the RDF file format. Specify null if not applicable.

fileExtensions - The RDF format's file extensions, e.g. rdf for RDF/XML files. The first item in the list is interpreted as the default file extension for the format.

supportsNamespaces - True if the RDFFormat supports the encoding of namespace/prefix information and false otherwise.

supportsContexts - True if the RDFFormat supports the encoding of contexts/named graphs and false otherwise.

supportsRDFStar - True if the RDFFormat supports the encoding of RDF-star triples natively and false otherwise.

RDFFormat

@Deprecated(since="3.2.0")
public RDFFormat(String name,
 Collection<String> mimeTypes,
 Charset charset,
 Collection<String> fileExtensions,
 IRI standardURI,
 boolean supportsNamespaces,
 boolean supportsContexts)

Deprecated.

since 3.2.0

Creates a new RDFFormat object.

Parameters:

name - The name of the RDF file format, e.g. "RDF/XML".

mimeTypes - The MIME types of the RDF file format, e.g. application/rdf+xml for the RDF/XML file format. The first item in the list is interpreted as the default MIME type for the format.

charset - The default character encoding of the RDF file format. Specify null if not applicable.

fileExtensions - The RDF format's file extensions, e.g. rdf for RDF/XML files. The first item in the list is interpreted as the default file extension for the format.

standardURI - The standard URI that has been assigned to this format by a standards organisation or null if it does not currently have a standard URI.

supportsNamespaces - True if the RDFFormat supports the encoding of namespace/prefix information and false otherwise.

supportsContexts - True if the RDFFormat supports the encoding of contexts/named graphs and false otherwise.

RDFFormat

public RDFFormat(String name,
 Collection<String> mimeTypes,
 Charset charset,
 Collection<String> fileExtensions,
 IRI standardURI,
 boolean supportsNamespaces,
 boolean supportsContexts,
 boolean supportsRDFStar)

Creates a new RDFFormat object.

Parameters:

name - The name of the RDF file format, e.g. "RDF/XML".

mimeTypes - The MIME types of the RDF file format, e.g. application/rdf+xml for the RDF/XML file format. The first item in the list is interpreted as the default MIME type for the format.

charset - The default character encoding of the RDF file format. Specify null if not applicable.

fileExtensions - The RDF format's file extensions, e.g. rdf for RDF/XML files. The first item in the list is interpreted as the default file extension for the format.

standardURI - The standard URI that has been assigned to this format by a standards organisation or null if it does not currently have a standard URI.

supportsNamespaces - True if the RDFFormat supports the encoding of namespace/prefix information and false otherwise.

supportsContexts - True if the RDFFormat supports the encoding of contexts/named graphs and false otherwise.

supportsRDFStar - True if the RDFFormat supports the encoding of RDF-star triples natively and false otherwise.

Method Details

getAcceptParams

public static List<String> getAcceptParams(Iterable<RDFFormat> rdfFormats,
 boolean requireContext,
 RDFFormat preferredFormat)

Processes the supplied collection of RDFFormats and assigns quality values to each based on whether context must be supported and whether the format is preferred.

Parameters:

rdfFormats - The RDFFormats to process.

requireContext - True to decrease the quality value for formats where supportsContexts() returns false.

preferredFormat - The preferred RDFFormat. If it is not in the list then the quality of all formats will be processed as if they are not preferred.

Returns:

A list of strings containing the content types and an attached q-value specifying the quality for the format for each type.

supportsNamespaces

public boolean supportsNamespaces()

Return true if the RDFFormat supports the encoding of namespace/prefix information.

supportsContexts

public boolean supportsContexts()

Return true if the RDFFormat supports the encoding of contexts/named graphs.

supportsRDFStar

public boolean supportsRDFStar()

Return true if the RDFFormat supports the encoding of RDF-star triples natively.

hasStandardURI

public boolean hasStandardURI()

Returns:

True if a standard URI has been assigned to this format by a standards organisation.

getStandardURI

public IRI getStandardURI()

Returns:

The standard URI that has been assigned to this format by a standards organisation or null if it does not currently have a standard URI.