fileHeader — States source and purpose of file
fileHeader :  [name]
     author+
     (creationDate | fileCreationDate)
     fileVersion?
     description?
     reference*
     modificationRecord*
     provenance*
The header element requires at least one author and a creation date; optional content includes version indicator, description, references, and modification records.
author
 | 
creationDate
 | 
fileCreationDate
 | 
fileVersion
 | 
description
 | 
reference
 | 
modificationRecord
 | 
provenance
 | 
2011-03-25