# KEHOME/knowledge/application/SemanticWeb/DAML/rdf.txt
# rhm Nov/7/2002

#=============================================================#
# KR version of "http://www.w3.org/1999/02/22-rdf-syntax-ns#" #
#=============================================================#

#<?xml version="1.0"?>

#<RDF
#  xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
#  xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
#  xmlns:s="http://www.w3.org/2000/01/rdf-schema#">

#<!--
#  This is the RDF Schema for the RDF data model as described in the
#  Resource Description Framework (RDF) Model and Syntax Specification
#  http://www.w3.org/TR/REC-rdf-syntax -->

# RDF - KR aliases
#=================
Class is concept
Instance is unit
Resource is existent
Property is attribute
Container is group
Alt is enumeration
Bag is multiset
Seq is list

# hierarchy
#==========
Statement iss statement  # is subclass of KR statement
value     isu Property   # is instance of

# definition
#===========
# Statement ::=
#	subject has predicate = object
triple iss relation with
	label=[predicate, subject, object],
	format=[Property:1, Resource:2, value:3],
	meaning={$2 has $1 = $3}

# Properties
#===========
Resource has type
Statement has
	predicate = Property,
	subject = Resource,
	object = value

# comments
#=========
type has comment="Identifies the Class of a resource"
Statement has comment="A triple consisting of a predicate, a subject, and an object."
Property has comment="A name of a property, defining specific meaning for the property"
Bag has comment="An unordered collection"
Seq has comment="An ordered collection"
Alt has comment="A collection of alternatives"
predicate has comment="Identifies the property used in a statement when representing the statement in reified form"
subject has comment="Identifies the resource that a statement is describing when representing the statement in reified form"
object has comment="Identifies the object of a statement when representing the statement in reified form"
value has comment="Identifies the principal value (usually a string) of a property when the property value is a structured resource"

#</RDF>