function toXml()
{
if (true || $this->oCachedXml == null) {
$oDoc = AnwUtils::newDomDocument();
$oNodeRoot = $oDoc->createElement('doc');
$oDoc->appendChild($oNodeRoot);
//export fields
$aoFields = $this->getContentFieldsContainer()->getContentFields();
foreach ($aoFields as $sFieldName => $oContentField) {
try {
$oNodeField = $oDoc->createElement($sFieldName);
if ($oContentField instanceof AnwStructuredContentField_atomic) {
$asFieldValues = $this->getContentFieldValues($sFieldName);
//export field values
//TODO : use getContentFieldValuesAsXml ?
foreach ($asFieldValues as $sFieldValue) {
$oValueNode = AnwXml::xmlCreateElementWithChilds($oNodeRoot->ownerDocument, self::XMLNODE_VALUE, $sFieldValue);
$oNodeField->appendChild($oValueNode);
}
} else {
//composed field
//$aoSubContents = $this->getSubContents($sFieldName, $bWithDefaultValues, $bWithMissingValues);
$aoSubContents = $this->getSubContents($sFieldName);
foreach ($aoSubContents as $oSubContent) {
$sSubContentValue = $oSubContent->toXmlString();
$oValueNode = AnwXml::xmlCreateElementWithChilds($oNodeRoot->ownerDocument, self::XMLNODE_VALUE, $sSubContentValue);
$oNodeField->appendChild($oValueNode);
//$oSubXmlNew = $oDoc->importNode($oSubXml->documentElement, true);
}
//print htmlentities(AnwUtils::xmlDumpNode($oNodeField));
}
$oNodeRoot->appendChild($oNodeField);
} catch (AnwContentFieldValueNotFoundException $e) {
//we skip this node as it has no value and we requested $bThrowExceptionWhenMissing
}
}
$this->oCachedXml = $oDoc;
}
return clone $this->oCachedXml;
}