fileHeader — States source and purpose of file
fileHeader :  [name]
     (author, fileCreationDate, fileVersion?, description?, reference*, modificationRecord*)
| name (optional) - the name of the file | 
The header element requires an author, a creation date and a version indicator; optional content are description, references and mod records.
| DAVEfunc | 
| author | 
| fileCreationDate | 
| fileVersion | 
| description | 
| reference | 
| modificationRecord |