Transcription: You're probably asking yourself, well, if I wanted just character data, why do I have to declare these elements so that to specify they only contain parseable character data? Well, this again comes back to what we talked about earlier when we talked about declaring a DTD. Once you start down the road and you put that doctype tag in, you have to declare everything. One thing that XML processors cannot deal with at all is ambiguity. Ambiguous content models cannot exist in XML. because XML doesn't know what to do with them. You see, if you create your own content model without defining a documen ...