1. A method for document classification in a document creation application comprising: providing a security classification toolbar incorporated within an extendable mark-up language (XML) based word processing document of the document creation application, the classification toolbar providing a security classification selection input; populating the security classification selection input in the classification toolbar with a plurality of security classification selections based upon pre-defined security classification criteria, the pre-defined security classification criteria defining the plurality of security classification selections available to a user of the document creation application for applying classification to the word processing document; receiving a security classification selection input from the plurality of security classification selections, selected by the user, from the security classification selections populated in the toolbar; applying visual markings associated with the selected security classification input, the visual markings inserted within editable text portions in a body, a header or a footer of the XML based word processing document in the document creation application, the visual markings to provide visual identification within the editable text portion of the XML based word processing document that the XML based word processing document has been security classified when the security classification has been selected; and assigning XML security classification properties associated with the selected security classification input in document metadata embedded in the XML based word processing document identifying the selected security classification input.