How to know if a DTD is validated or correct?

Question

I have an example of DTD script here, and I was wondering if they are valid, are there any online validator for DTD?

<!ELEMENT A (B* |C+,D)>
<ATTLIST A
    AA CDATA #REQUIRED
    AB CDATA #REQUIRED
    AC(0|1|2) #REQUIRED
>
<!ELEMENT B EMPTY>
<!ATTLIST C(B)>

And Another Question. in the line

 !ELEMENT B EMPTY>
    <!ATTLIST C(B)>

What does that actually mean? can any one provide example?

And this A (B* |C+,D)

Dave Everitt · Accepted Answer · 2017-05-10T22:22:57.620

0

Try this XML DTD validator (dead link removed).

edited May 10 '17 at 22:22

answered Feb 26 '12 at 10:32

Dave Everitt

dead link now removed! – Dave Everitt May 10 '17 at 22:23
xmlvalidation.com only seems to validate XML, not the DTD. – icedwater Aug 06 '18 at 08:32
A standard XML document needs no DTD. If you have an external DTD perhaps you could enter the DTD url? – Dave Everitt Aug 06 '18 at 15:08

1 Answers1