function assetTreeSwitchDataDefinitionForBlock(aohs\AssetOperationHandlerService $service, p\Child $child, $params = NULL, &$results = NULL)
{
    global $common_assets_site_name;
    $type = $child->getType();
    if ($type != a\DataBlock::TYPE) {
        return;
    }
    if (!isset($params["cascade"])) {
        throw new \Exception("The Cascade object is not supplied");
    } else {
        $cascade = $params["cascade"];
    }
    $block = $child->getAsset($service);
    $b_name = $block->getName();
    if ($b_name == "_footer-contact") {
        $dd_name = "Footer Contact";
    } elseif ($b_name == "_left-column") {
        $dd_name = "Left Column";
    } elseif ($b_name == "_right-column") {
        $dd_name = "Right Column";
    } elseif ($b_name == "_site-info") {
        $dd_name = "Site Info";
    } else {
        return;
    }
    $dd = $cascade->getAsset(a\DataDefinition::TYPE, $dd_name, $common_assets_site_name);
    $st = new p\StructuredData($dd->getStructuredData(), $service, $dd->getId());
    $identifiers = $block->getIdentifiers();
    foreach ($identifiers as $identifier) {
        // create the correct number of instances for multiple field
        if (u\StringUtility::endsWith($identifier, ";0") && $st->hasIdentifier($identifier)) {
            $st->createNInstancesForMultipleField($block->getNumberOfSiblings($identifier), $identifier);
        }
        // map the data
        if ($st->hasNode($identifier) && $block->isTextNode($identifier)) {
            $st->setText($identifier, $block->getText($identifier));
        } elseif ($st->hasNode($identifier) && $block->isAssetNode($identifier)) {
            $asset_node_type = $block->getAssetNodeType($identifier);
            if ($asset_node_type == "page" && $block->getPageId($identifier) != null) {
                $st->setPage($identifier, $cascade->getPage($block->getPageId($identifier)));
            } elseif ($asset_node_type == "file" && $block->getFileId($identifier) != null) {
                $st->setFile($identifier, $cascade->getFile($block->getFileId($identifier)));
            } elseif ($asset_node_type == "block" && $block->getBlockId($identifier) != null) {
                $st->setBlock($identifier, a\Block::getBlock($service, $block->getBlockId($identifier)));
            } elseif ($asset_node_type == "page,file,symlink" && $block->getLinkableId($identifier) != null) {
                $st->setLinkable($identifier, a\Linkable::getLinkable($service, $block->getLinkableId($identifier)));
            }
        }
    }
    $block->setStructuredData($st);
}
 public function removePhantomNodes(StructuredDataPhantom $sdp)
 {
     $new_sd = new StructuredData($this->data_definition->getStructuredData(), $this->getService(), $this->data_definition->getId());
     $sdp_ids = $sdp->getIdentifiers();
     foreach ($sdp_ids as $id) {
         try {
             if ($this->isIdentifierOfFirstNode($id)) {
                 $num_of_instances = $this->getNumberOfSiblings($id);
                 if ($num_of_instances > 1) {
                     $new_sd->createNInstancesForMultipleField($num_of_instances, $id);
                 }
             }
         } catch (e\NodeException $e) {
             echo $id, BR;
             continue;
             // skip phantom nodes
         }
     }
     foreach ($sdp_ids as $id) {
         try {
             self::copyData($sdp, $new_sd, $id);
         } catch (e\NodeException $e) {
             continue;
             // skip phantom nodes
         }
     }
     return $new_sd;
 }