/**
* Get segments
*
* @return array
* @throws Exception
*/
function getSegments()
{
$message_schema = $this->message->getSchema("message", $this->messageName);
$xpath = new CHL7v2MessageXPath($message_schema);
$segment = $xpath->queryUniqueNode("//segments");
$tree = array();
$this->getSegmentTree($segment, $tree);
return $tree;
}
/**
* Get the node corresponding to an XPath
*
* @param string $nodeName The XPath to the node
* @param DOMNode|null $contextNode The context node from which the XPath starts
* @param array|null &$data Nodes data
* @param boolean $root Is root node ?
*
* @return DOMNode The node
*/
function queryNode($nodeName, DOMNode $contextNode = null, &$data = null, $root = false)
{
$xpath = new CHL7v2MessageXPath($contextNode ? $contextNode->ownerDocument : $this);
return $data[$nodeName] = $xpath->queryUniqueNode($root ? "//{$nodeName}" : "{$nodeName}", $contextNode);
}