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namespace Gedcomx\Rs\Client;
/**
* An interface allowing a type to explicitly declare support for extension elements.
*/
interface SupportsExtensionElements {
/**
* Custom extension elements for a resource.
*
* @return Custom extension elements for a resource.
*/
public function getExtensionElements();
/**
* Finds the first extension of a specified type.
*
* @param string clas The type.
* @return mixed|null The extension, or null if none found.
*/
public function findExtensionOfType($class);
/**
* Find the extensions of a specified type.
*
* @param string class The type.
* @return mixed The extensions, possibly empty but not null.
*/
public function findExtensionsOfType($class);
/**
* Add an extension element.
*
* @param mixed element The extension element to add.
*/
public function addExtensionElement($element);
}