Use this function to perform any operations at the start of processing the entry.

Inputs: xml (XmlDocument), document (Document)
Outputs: Boolean or no return value. No return value is treated as returning true. If the function returns false, the entry is not processed and is ignored.
See also:  


function myPrefix_preProcessEntry(xml, document)
   set_param("ENTRY_ID") = xml:XPathValue("~/atom:id")