Internet DRAFT - draft-thierry-bulk-rdf
draft-thierry-bulk-rdf
Network Working Group P. Thierry
Internet-Draft Thierry Technologies
Intended status: Experimental August 7, 2013
Expires: February 8, 2014
BULK RDF namespace
draft-thierry-bulk-rdf-00
Abstract
This specification describes a BULK serialization of RDF ontologies
and graphs.
Status of This Memo
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Conventions and Terminology . . . . . . . . . . . . . . . . 3
2. BULK RDF namespace . . . . . . . . . . . . . . . . . . . . . . 3
2.1. URI reference . . . . . . . . . . . . . . . . . . . . . . . 3
2.2. Base URI . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.3. URI prefix . . . . . . . . . . . . . . . . . . . . . . . . 4
2.4. blank . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.5. RDF literals . . . . . . . . . . . . . . . . . . . . . . . 4
2.5.1. Plain literal . . . . . . . . . . . . . . . . . . . . . 4
2.5.2. Typed literal . . . . . . . . . . . . . . . . . . . . . 5
2.5.3. XMLLiteral . . . . . . . . . . . . . . . . . . . . . . 5
2.6. Triples . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.7. Turtle-like statements . . . . . . . . . . . . . . . . . . 5
2.8. RDF vocabulary . . . . . . . . . . . . . . . . . . . . . . 5
2.9. RDF embedding . . . . . . . . . . . . . . . . . . . . . . . 6
3. Security Considerations . . . . . . . . . . . . . . . . . . . . 6
4. References . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.1. Normative References . . . . . . . . . . . . . . . . . . . 7
4.2. Informative references . . . . . . . . . . . . . . . . . . 7
Appendix A. Example: RDF Schema vocabulary . . . . . . . . . . . . 8
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1. Introduction
1.1. Conventions and Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
Literal numerical values are provided in decimal or hexadecimal as
appropriate. Hexadecimal literals are prefixed with "0x" to
distinguish them from decimal literals.
BULK bytes sequences and expressions are described with the same
conventions than used in the BULK 1.0 specification [BULK1]
2. BULK RDF namespace
The RDF namespace is an official namespace identified by the UUID
<urn:uuid:ed460331-a89b-5742-a8de-907dff727779> (BULK,
"http://www.w3.org/1999/02/22-rdf-syntax-ns#"). Its first purpose is
to serialize both RDF ontologies and graphs, but as RDF is deeply
rooted in the World Wide Web and the REST architecture, some of the
names and forms defined in this specification are intended to be used
in applications related to those.
This specification defines the type "URIString", which is an array
whose content is a string conforming to the "URI-reference"
production in [RFC3986] (section 4.1).
2.1. URI reference
name "0x1" (mnemonic: "uriref" )
shape "( uriref URIString )"
This form makes it possible to differentiate a string containing a
URI from a URI reference itself.
Type: "URIRef"
2.2. Base URI
name "0x2" (mnemonic: "base" )
shape "( base URIString )"
This form changes the current base URI for URI resolution. If the
given URI is relative, it must be resolved with the current base URI.
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2.3. URI prefix
name "0x3" (mnemonic: "prefix" )
shape "( prefix {uri} )"
Name's type EagerFunction
Form's type EagerFunction
Form's value a function that returns a URIRef whose content is the
concatenation of {uri} and its only argument (or returns {uri} if
called without arguments)
{uri} can be of type "URIString" or "URIRef". If it is of type
URIRef, the above description should be taken as if the form is of
shape "( prefix ( uriref {uri} ) )".
2.4. blank
name "0x4" (mnemonic: "blank" )
shape "( blank )"
Name's type EagerFunction
Form's type Expr
Form's value a new blank node. If a same blank node must be used in
several forms, it should be made the value of a name.
2.5. RDF literals
Literals are arbitrary data that can be an object in an RDF triple.
It is important to note that their BULK serialization doesn't need to
denote the string of their lexical form.
Any array used as object in an RDF triple has the semantics of a
plain literal without language tag.
2.5.1. Plain literal
name "0x5" (mnemonic: "plain" )
shape "( plain {lang}:Array {literal}:Array )"
This is a plain RDF literal. {lang} is the language tag.
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2.5.2. Typed literal
name "0x6" (mnemonic: "type" )
shape "( type {id}:URIRef {literal} )"
This is a typed RDF literal. {id} is the datatype URI. Each type
defines what is legal as "{literal}".
2.5.3. XMLLiteral
name "0x7" (mnemonic: "xmlliteral" )
value "( uriref
"http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral" )"
A literal with this type SHOULD contain a BULK serialization of XML
(cf. [BULK-XML]). An application MUST NOT use an array for this
literal for anyhting else than a string that belongs to the lexical
space defined for
<http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral>.
2.6. Triples
name "0x8" (mnemonic: "triples" )
shape "( triples {triples} )"
"{triples}" must be a sequence of "( {subj}:URIRef {pred}:URIRef
{obj} )".
2.7. Turtle-like statements
name "0x9" (mnemonic: "turtle" )
shape "( turtle {statements} )"
"{statements}" MUST be a sequnce of "( {subj}:URIRef {preds} )",
where "{preds}" MUST be a sequence of "( {pred}:URIRef {objs} )",
where "{objs}" is a sequence.
2.8. RDF vocabulary
The following names are associated with "uriref" forms, with a base
URI of <http://www.w3.org/1999/02/22-rdf-syntax-ns#>. Their mnemonic
is the lowercased URI reference.
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0xA type
0xB Property
0xC Statement
0xD subject
0xE predicate
0xF object
0x10 Bag
0x11 Seq
0x12 Alt
0x13 value
0x14 List
0x15 nil
0x16 first
0x17 rest
0x18 PlainLiteral
2.9. RDF embedding
name "0x20" (mnemonic: "this-resource" )
shape "this-resource"
This expression is intended to help embedding RDF metadata alongside
or within a resource. It has the semantics of a blank node that
designates this resource. What makes a resource the current
described resource is application-dependent.
3. Security Considerations
4. References
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4.1. Normative References
[BULK1] Thierry, P., "Binary Uniform Language Kit 1.0",
draft-thierry-bulk-02 (work in progress),
August 2013.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC3986] Berners-Lee, T., Fielding, R., and L. Masinter,
"Uniform Resource Identifiers (URI): Generic Syntax",
RFC 3986, STD 66, January 2005.
4.2. Informative references
[BULK-XML] Thierry, P., "BULK Simple XML namespace",
draft-thierry-bulk-xml-00 (work in progress),
August 2013.
[RDF-CONCEPTS] Klyne, G. and J. Carroll, "Resource Description
Framework (RDF): Concepts and Abstract Syntax",
February 2004, <http://www.w3.org/TR/2004/
REC-rdf-concepts-20040210/>.
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Appendix A. Example: RDF Schema vocabulary
Here is the text notation of a BULK stream defining references for
each element in the RDF Schema vocabulary. The whole stream is 444
bytes in length.
( bulk:version 1 0 )
( bulk:ns 32 rdf )
( bulk:ns* 33 rdfs )
( define rdfs:schema ( prefix "http://www.w3.org/2000/01/rdf-schema#" ) )
( define rdfs:resource ( rdfs:schema "Resource" ) )
( define rdfs:class ( rdfs:schema "Class" ) )
( define rdfs:subclassof ( rdfs:schema "subClassOf" ) )
( define rdfs:subpropertyof ( rdfs:schema "subPropertyOf" ) )
( define rdfs:comment ( rdfs:schema "comment" ) )
( define rdfs:label ( rdfs:schema "label" ) )
( define rdfs:domain ( rdfs:schema "domain" ) )
( define rdfs:range ( rdfs:schema "range" ) )
( define rdfs:seealso ( rdfs:schema "seeAlso" ) )
( define rdfs:isdefinedby ( rdfs:schema "isDefinedBy" ) )
( define rdfs:literal ( rdfs:schema "Literal" ) )
( define rdfs:container ( rdfs:schema "Container" ) )
( define rdfs:containermembershipproperty ( rdfs:schema "ContainerMembershipProperty" ) )
( define rdfs:member ( rdfs:schema "member" ) )
( define rdfs:datatype ( rdfs:schema "Datatype" ) )
( define rdfs:schema* ( rdfs:schema ) )
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Here is the text notation of a BULK stream containg a small part of
the RDF Schema ontology. The whole stream is 375 bytes in length
(the corresponding RDF/XML document would be 1525 bytes in length).
( bulk:version 1 0 )
( bulk:ns 32 rdf )
( bulk:ns 33 rdfs )
( turtle
( rdfs:resource
( rdf:type rdfs:class )
( rdfs:isdefinedby rdfs:schema* )
( rdfs:label "Resource" )
( rdfs:comment "The class resource, everything." ) )
( rdfs:class
( rdf:type rdfs:class )
( rdfs:isdefinedby rdfs:schema* )
( rdfs:label "Class" )
( rdfs:comment "The class of classes." )
( rdfs:subclassof rdfs:resource ) )
( rdfs:subclassof
( rdf:type rdf:property )
( rdfs:isdefinedby rdfs:schema* )
( rdfs:label "subClassOf" )
( rdfs:comment "The subject is a subclass of a class." )
( rdfs:range rdfs:class )
( rdfs:domain rdfs:class ) )
( rdfs:subpropertyof
( rdf:type rdf:property )
( rdfs:isdefinedby rdfs:schema* )
( rdfs:label "subPropertyOf" )
( rdfs:comment "The subject is a subproperty of a property." )
( rdfs:range rdf:property )
( rdfs:domain rdf:property ) ) )
Author's Address
Pierre Thierry
Thierry Technologies
EMail: pierre@nothos.net
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