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/* $Id$
Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: wielemak@science.uva.nl
WWW: http://www.swi-prolog.org
Copyright (C): 1985-2006, University of Amsterdam
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
As a special exception, if you link this library with other files,
compiled with a Free Software compiler, to produce an executable, this
library does not by itself cause the resulting executable to be covered
by the GNU General Public License. This exception does not however
invalidate any other reasons why the executable file might be covered by
the GNU General Public License.
*/
:- module(xsdp_type,
[ xsdp_type/1, % ?Type
xsdp_uri_type/2, % ?URI, ?Type
xsdp_numeric_uri/2, % ?URI, ?Primary
xsdp_subtype_of/2, % ?Type, ?Super
xsdp_convert/3 % +Type, +Content, -Value
]).
/** <module> XML-Schema primitie types
This modules provides support for the primitive XML-Schema (XSD)
datatypes. It defines the type hierarchy which allows for reasoning over
types as well as xsdp_convert/3 to convert XML content to a natural
Prolog representation of the XSD type.
Based on the W3C definitions at
* http://www.w3.org/TR/xmlschema-2/#built-in-datatypes
The current implementation is incomplete and only there to test the API
and its integration with rdf:dataType=Type handling in the RDF parser.
The extra 'p' in the module prefix (xsdp_*) is used to allow for a
module xsd_*, providing full user-defined XSD types on top of this
module.
*/
ns('http://www.w3.org/2001/XMLSchema#').
/*******************************
* PRIMITIVE TYPE HIERARCHY *
*******************************/
%% xsdp_type(?Type)
%
% Test/generate the names for the XML schema primitive types
xsdp_type(Type) :-
subtype_of(Type, _).
%% xsdp_uri_type(?URI, ?Type)
%
% True if URI is the URI for the the XML-Schema primitive Type.
xsdp_uri_type(URI, Type) :-
xsd_local_id(URI, Type),
subtype_of(Type, _).
%% xsdp_subtype_of(?Type, ?Super)
%
% True if Type is a (transitive) subtype of Super.
xsdp_subtype_of(Type, Type).
xsdp_subtype_of(Type, Super) :-
( nonvar(Type)
-> subtype_of(Type, Super0),
Super0 \== (-),
xsdp_subtype_of(Type, Super)
; subtype_of(Sub0, Super),
xsdp_subtype_of(Type, Sub0)
).
subtype_of(anyType, -).
subtype_of(anySimpleType, anyType).
% string hierarchy
subtype_of(string, anySimpleType).
subtype_of(normalizedString, string).
subtype_of(token, normalizedString).
subtype_of(language, token).
subtype_of('Name', token).
subtype_of('NCName', 'Name').
subtype_of('NMTOKEN', token).
subtype_of('NMTOKENS', 'NMTOKEN').
subtype_of('ID', 'NCName').
subtype_of('IDREF', 'NCName').
subtype_of('IDREFS', 'IDREF').
subtype_of('ENTITY', 'NCName').
subtype_of('ENTITIES', 'ENTITY').
% numeric hierarchy
subtype_of(decimal, anySimpleType).
subtype_of(integer, decimal).
subtype_of(nonPositiveInteger, integer).
subtype_of(negativeInteger, nonPositiveInteger).
subtype_of(long, integer).
subtype_of(int, long).
subtype_of(short, int).
subtype_of(byte, short).
subtype_of(nonNegativeInteger, integer).
subtype_of(unsignedLong, nonNegativeInteger).
subtype_of(positiveInteger, nonNegativeInteger).
subtype_of(unsignedInt, unsignedLong).
subtype_of(unsignedShort, unsignedInt).
subtype_of(unsignedByte, unsignedShort).
% other simple types
subtype_of(duration, anySimpleType).
subtype_of(dateTime, anySimpleType).
subtype_of(time, anySimpleType).
subtype_of(date, anySimpleType).
subtype_of(gYearMonth, anySimpleType).
subtype_of(gYear, anySimpleType).
subtype_of(gMonthDay, anySimpleType).
subtype_of(gDay, anySimpleType).
subtype_of(gMonth, anySimpleType).
subtype_of(boolean, anySimpleType).
subtype_of(base64Binary, anySimpleType).
subtype_of(hexBinary, anySimpleType).
subtype_of(float, anySimpleType).
subtype_of(double, anySimpleType).
subtype_of(anyURI, anySimpleType).
subtype_of('QName', anySimpleType).
subtype_of('NOTATION', anySimpleType).
%% xsdp_numeric_uri(?URI, -PromoteURI) is nondet.
%
% Table mapping all XML-Schema numeric URIs into the type they
% promote to. Types are promoted to =integer=, =float=, =double=
% and =decimal=.
term_expansion(integer_types, Clauses) :-
findall(integer_type(Type), xsdp_subtype_of(Type, integer), Clauses).
term_expansion(xsd_local_ids, Clauses) :-
ns(NS),
findall(xsd_local_id(URI, Type),
( xsdp_type(Type),
atom_concat(NS, Type, URI)
),
Clauses).
term_expansion(numeric_uirs, Clauses) :-
findall(xsdp_numeric_uri(URI, PrimaryURI),
( ( integer_type(Type), Primary = integer
; Type = float, Primary = float
; Type = double, Primary = double
; Type = decimal, Primary = decimal
),
xsd_local_id(URI, Type),
xsd_local_id(PrimaryURI, Primary)
),
Clauses).
integer_types.
xsd_local_ids.
numeric_uirs.
%% xsdp_convert(+Type, +Content, -Value)
%
% Convert the content model Content to an object of the given XSD
% type and return the Prolog value in Value.
xsdp_convert(URI, Content, Value) :-
( xsd_local_id(URI, Type)
-> convert(Type, Content, Value)
; convert(URI, Content, Value)
).
convert(anyType, Term, Term) :- !.
convert(anySimpleType, [Simple], Simple) :- !.
% strings
convert(string, [String], String) :- !.
% numbers
convert(IntType, [Text], Integer) :-
integer_type(IntType), !,
atom_number(Text, Integer),
( integer(Integer),
validate_int_domain(IntType, Integer)
-> true
; throw(error(domain_error(Text, IntType), _))
).
convert(float, [Text], Float) :- !,
atom_number(Text, Number),
Float is float(Number).
convert(double, [Text], Float) :- !,
atom_number(Text, Number),
Float is float(Number).
convert(_Any, [X], X) :- !. % TBD: provide for more types
convert(_Any, X, X).
validate_int_domain(integer, _).
validate_int_domain(int, _).
validate_int_domain(long, _).
validate_int_domain(nonPositiveInteger, I) :- \+ I > 0.
validate_int_domain(negativeInteger, I) :- I < 0.
validate_int_domain(short, I) :- between(-32768, 32767, I).
validate_int_domain(byte, I) :- between(-128, 127, I).
validate_int_domain(nonNegativeInteger, I) :- \+ I < 0.
validate_int_domain(unsignedLong, I) :- I >= 0.
validate_int_domain(positiveInteger, I) :- I > 0.
validate_int_domain(unsignedInt, I) :- I >= 0.
validate_int_domain(unsignedShort, I) :- between(0, 65535, I).
validate_int_domain(unsignedByte, I) :- between(0, 255, I).
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