code: public static String getEmbeddedCollectionPrefix(String embeddedCollectionName)
      {
          return embeddedCollectionName.substring(0,
                  embeddedCollectionName.indexOf(Constants.EMBEDDED_COLUMN_NAME_DELIMITER));
      }
docs: Gets the embedded collection prefix.
  
  @param embeddedCollectionName
  the embedded collection name
  @return the embedded collection prefix