[Expat-discuss] Re: Newbies questions
Tue Aug 20 02:40:02 2002
> What's the diference between a parser and a validator ? (in my poor
> perception both are the same :-) )
To use expat as a parser, the XML must be "well-formed". This must mean that
it is 'valid' XML - i.e. all the tags that are opened are closed, you aren't
missing any '>'s, and so on.
To be valid (i.e. validated by a validating parser) the XML must conform to
some type of given structure, like a DTD. (It must also be well-formed, as
above). Obviously, if there is no DTD specified (or similar structure-giving
device), an XML document can't be 'valid'.
Expat checks for well-formedness, but does not validate (in the sense given
Obviously it depends on your situation whether being valid (in this way) is
important, or whether well-formedness is enough. (Well-formness is _always_
important, though, unless you want to spend a lot of time coding for possible
typos in the XML).
> And some practical tutorials about XML DTD and XSL ?
Actually, when I first learned how to use XML (and DTD's and XSL and so on), I
found that good-old-fashioned books were best. So I'd personally recommend
your local library. I guess it depends on how good that library is (mine is a
university library, so probably more up-to-date than some others). No doubt
others on the list will have online tutorials that might be useful.
Hope this helps.
= Tony Meyer