On Apache
Under GNU General Public License
2012-05-25 01:37 @38.107.179.240 Crawled by CCBot/1.0 (+http://www.commoncrawl.org/bot.html)
RDF::Core::Function(3pm) User Contributed Perl Documentation RDF::Core::Function(3pm)
NAME
RDF::Core::Function - a package of functions for query language.
DESCRIPTION
When there is a function found while evaluating query, its parameters are evaluated and
passed to RDF::Core::Function apropriate piece of code. The code reference is obtained in
a hash returned by getFunctions() call. Each function accepts RDF::Core::Literal or
RDF::Core::Resource objects as paramaters and returns a tuple of arrays (array of two
array references). The first references to an array of function results - Resource or
Literal objects, the second one references to an array of predicates that could be used
instead of the function. This is not always applicable, so the second array can be empty.
For example, a function call:
someBag.member()
returns ([uri://uri-of-the-first-member,....],[rdf:_1,...]).
There is a special parameter - a subject parameter, which says that a function is at
position of property. For example:
subproperty(schema:SomeProperty)
has no subject parameter defined and returns property names that are subproperties of
given schema:SomeProperty.
data:SomeObject.subproperty(schema:SomeProperty)
has subject parameter data:SomeObject and return values of subproperties for subject.
Interface
o new(%options)
Available options are:
o Data
RDF::Core::Model object that contains data to be queried.
o Schema
RDF::Core::Model object that contains RDF schema.
o Factory
RDF::Core::NodeFactory object, that produces resource and literal objects.
o getFunctions
Returns a hash reference where each key is a name of a functions and value is a
reference to an implementation code.
Functions implemented
o subclass(X)
Not defined subject parameter:
Find all subclasses of X in Schema and return them if they have an instance in Data.
Defined subject parameter:
Result is not defined, dies.
o subproperty(X)
Not defined subject parameter:
Find all subproperties of X in Schema and return them if they occur in Data.
Defined subject parameter:
Find all subproperties of X in Schema and return their values for subject, if found.
o member()
Not defined subject parameter:
Result is not defined, dies.
Defined subject parameter:
Find all container members of subject.
LICENSE
This package is subject to the MPL (or the GPL alternatively).
AUTHOR
Ginger Alliance, rdf AT gingerall.cz
SEE ALSO
RDF::Core::Query
perl v5.10.0 2002-07-12 RDF::Core::Function(3pm)
Generated by $Id: phpMan.php,v 4.49 2006/02/26 13:18:18 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
2012-05-25 01:37 @38.107.179.240 Crawled by CCBot/1.0 (+http://www.commoncrawl.org/bot.html)