This class is used by the MimeParser, to create new MIME message holders.
Each MIME parse instances is custmozied wit hits own factory, which it
will use to create MIME header holders.
createHeaderHolder(MimeParser parser) Create a new header holder to hold the parser's result.
Parameters: parser - The parser that has something to parse.
Create a new header holder to hold the parser's result.
Parameters: parser - The parser that has something to parse. A MimeParserHandler compliant object.