def setFormat(self, format):
        """ Set text format and Dublin Core resource format.
        """
        value = str(format)
        old_value = self.text_format

        if value == 'text/html' or value == 'html':
            self.text_format = 'html'
        elif value == 'text/plain':
            if self.text_format not in ('structured-text', 'plain'):
                self.text_format = 'structured-text'
        elif value == 'plain':
            self.text_format = 'plain'
        else:
            self.text_format = 'structured-text'

        # Did the format change? We might need to re-cook the content.
        if value != old_value:
            if html_headcheck(self.text) and value != 'plain':
                self.text = bodyfinder(self.text)

            self._edit( self.text
                      , text_format=self.text_format
                      , safety_belt=self._safety_belt
                      )

    def edit(self, text_format, text, file='', safety_belt=''):
        """ Update the document.

        To add webDav support, we need to check if the content is locked, and if
        so return ResourceLockedError if not, call _edit.

        Note that this method expects to be called from a web form, and so
        disables header processing
        """
        self.failIfLocked()
        if not self._safety_belt_update(safety_belt=safety_belt):
            msg = _(u'Intervening changes from elsewhere detected. '
                    u'Please refetch the document and reapply your changes. '
                    u'(You may be able to recover your version using the '
                    u"browser 'back' button, but will have to apply them to "
                    u'a freshly fetched copy.)')
            raise EditingConflict(msg)
        if file and (type(file) is not type('')):
            contents=file.read()
            if contents:
                text = contents
        if html_headcheck(text) and text_format.lower() != 'plain':
            text = bodyfinder(text)
        self.setFormat(text_format)
        self._edit(text)
        self.reindexObject()

    def edit(self, text_format, text, file='', safety_belt=''):
        """ Update the document.

        To add webDav support, we need to check if the content is locked, and if
        so return ResourceLockedError if not, call _edit.

        Note that this method expects to be called from a web form, and so
        disables header processing
        """
        self.failIfLocked()
        if file and (type(file) is not type('')):
            contents=file.read()
            if contents:
                text = contents
        if html_headcheck(text) and text_format.lower() != 'plain':
            text = bodyfinder(text)
        self.setFormat(text_format)
        self._edit(text=text, text_format=text_format, safety_belt=safety_belt)
        self.reindexObject()

    def PUT(self, REQUEST, RESPONSE):
        """ Handle HTTP (and presumably FTP?) PUT requests """
        self.dav__init(REQUEST, RESPONSE)
        body = REQUEST.get('BODY', '')
        guessedformat = REQUEST.get_header('Content-Type', 'text/plain')
        ishtml = (guessedformat == 'text/html') or utils.html_headcheck(body)

        if ishtml: self.setFormat('text/html')
        else: self.setFormat('text/plain')

        try:
            self.edit(text_format=self.text_format, text=body)
        except 'EditingConflict', msg:
            # XXX Can we get an error msg through?  Should we be raising an
            #     exception, to be handled in the FTP mechanism?  Inquiring
            #     minds...
            get_transaction().abort()
            RESPONSE.setStatus(450)
            return RESPONSE

    def PUT(self, REQUEST, RESPONSE):
        """ Handle HTTP (and presumably FTP?) PUT requests """
        self.dav__init(REQUEST, RESPONSE)
        self.dav__simpleifhandler(REQUEST, RESPONSE, refresh=1)
        body = REQUEST.get('BODY', '')
        guessedformat = REQUEST.get_header('Content-Type', 'text/plain')
        ishtml = (guessedformat == 'text/html') or utils.html_headcheck(body)

        if ishtml: self.setFormat('text/html')
        else: self.setFormat('text/plain')

        try:
            headers, body, format = self.handleText(text=body)
            safety_belt = headers.get('SafetyBelt', '') 
            self.setMetadata(headers)
            self._edit(text=body, safety_belt=safety_belt)
        except 'EditingConflict', msg:
            # XXX Can we get an error msg through?  Should we be raising an
            #     exception, to be handled in the FTP mechanism?  Inquiring
            #     minds...
            get_transaction().abort()
            RESPONSE.setStatus(450)
            return RESPONSE

 def guessFormat(self, text):
     """ Simple stab at guessing the inner format of the text """
     if utils.html_headcheck(text): return 'html'
     else: return 'structured-text'