[Mediawiki-l] Are parser extension functions run serially or in parallel?

[Flip Mozart]

Hi! 

I wrote the code below for a custom tag <xdata>.  This tag can appear more than once in the same article. 

Suppose the custom tag appears exactly 5 times in an article.  It appears that the renderXdata() function below would be invoked 5 times too.  My question is: Is this function called (executed) serially or in parallel?  

If it's run serially, is there a way to run them in parallel?

function wfXdataExtension() 
   {
   global $wgParser;
   $wgParser->setHook( "xdata", "renderXdata" );
   }

function renderXdata( $input, $argv, &$parser ) 
   {    
   // Code that does something, such as retrieving data from a database or flat file 
   }

Filip
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