'Append attribute nodes into L{Content.data}.
Attributes in the I{schema} or I{xml} namespaces are skipped.
@param content: The current content being unmarshalled.
@type content: L{Content}'

def append_attributes(self, content):

    attributes = AttrList(content.node.attributes)
    for attr in attributes.real():
        name = attr.name
        value = attr.value
        self.append_attribute(name, value, content)
