code: function XML_BlockAlias_Prefix($TagPrefix, $Txt, $PosBeg, $Forward, $LevelStop) {
  
  		$loc = clsTbsXmlLoc::FindStartTagByPrefix($Txt, $TagPrefix, $PosBeg, false);
  
  		if ($Forward) {
  			$loc->FindEndTag();
  			return $loc->PosEnd;
  		} else {
  			return $loc->PosBeg;
  		}
  
  	}
docs: Function used by Block Alias
  The first start tag on the left is supposed to be the good one.
  Note: encapuslation is not yet supported in this version.