/**
  * Export the given reflected interface definition to the provided parent element.
  *
  * This method creates a new child element on the given parent XML element
  * and takes the properties of the Reflection argument and sets the
  * elements and attributes on the child.
  *
  * If a child DOMElement is provided then the properties and attributes are
  * set on this but the child element is not appended onto the parent. This
  * is the responsibility of the invoker. Essentially this means that the
  * $parent argument is ignored in this case.
  *
  * @param \DOMElement        $parent Element to augment.
  * @param InterfaceDescriptor $interface Element to export.
  *
  * @return \DOMElement
  */
 public function convert(\DOMElement $parent, InterfaceDescriptor $interface)
 {
     $child = new \DOMElement('interface');
     $parent->appendChild($child);
     /** @var InterfaceDescriptor $parentInterface */
     foreach ($interface->getParent() as $parentInterface) {
         $parentFqcn = is_string($parentInterface) === false ? $parentInterface->getFullyQualifiedStructuralElementName() : $parentInterface;
         $child->appendChild(new \DOMElement('extends', $parentFqcn));
     }
     $namespace = $interface->getNamespace()->getFullyQualifiedStructuralElementName();
     $child->setAttribute('namespace', ltrim($namespace, '\\'));
     $child->setAttribute('line', $interface->getLine());
     $child->appendChild(new \DOMElement('name', $interface->getName()));
     $child->appendChild(new \DOMElement('full_name', $interface->getFullyQualifiedStructuralElementName()));
     $this->docBlockConverter->convert($child, $interface);
     foreach ($interface->getConstants() as $constant) {
         $this->constantConverter->convert($child, $constant);
     }
     foreach ($interface->getMethods() as $method) {
         $this->methodConverter->convert($child, $method);
     }
     return $child;
 }