XML_RDDL::getResourcesByPurpose() – selects all resources of a specified nature


require_once 'XML/RDDL.php';

array XML_RDDL::getResourcesByPurpose ( string $purpose )


Gets all resources of a given purpose from an RDDL document. You have to call XML_RDDL::parseRDDL() first. The purpose of a resource is specified by the 'xlink:arcrole' attribute. The purpose of a resource link determines what the link will be used for. Frequently the purpose of a link can be determined from the nature of the referenced resource. For example the purpose of an XML Schema is typically schema validation, yet a schema may be comprised of a number of included modules and even when included modules are themselves an XML Schema, the purpose is as a module. You can find a list of well known purposes at http://www.rddl.org/purposes/.


  • string $purpose - purpose of the resources you want to get.

Return value

array array containing all resources with the specified purpose.


This function can not be called statically.

Usage example

Getting all normative references

require_once "XML/RDDL.php";
// create new parser
$rddl   = &new XML_RDDL();
// parse a document that contains RDDL resources
$result $rddl->parseRDDL('http://www.rddl.org');
// check for error
if (PEAR::isError($result)) {
sprintf"ERROR: %s (code %d)"$result->getMessage(), $result->getCode());
// get all normative references
$ref $rddl->getResourcesByPurpose('http://www.rddl.org/purposes#normative-reference');
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Last updated: Sat, 16 Feb 2019 — Download Documentation
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