Special character in dtd default attribute

[Ajay Goel]

I have a dtd which validates data
<!ATTLIST Attr1
OS (Windows | XP ) "Windows"
country (USA | CAN) "USA"

I need to add a special charater "slash" in one of the default values,
say OS (Windows | XP | 2000/NT) "Windows"

How do I do this? I tried creating entity but I couldn't create entity
for unparsed data.

[Johannes Koch]

Ajay Goel wrote:

I have a dtd which validates data
<!ATTLIST Attr1
OS (Windows | XP ) "Windows"
country (USA | CAN) "USA"
I need to add a special charater "slash" in one of the default values,
say OS (Windows | XP | 2000/NT) "Windows"

You can't; the values of the enumeration must meet the production rule
for Nmtoken:

[59] Enumeration ::= '(' S? Nmtoken (S? '|' S? Nmtoken)* S? ')'
<http://www.w3.org/TR/REC-xml.html#NT-Enumeration>

[7] Nmtoken ::= (NameChar)+
<http://www.w3.org/TR/REC-xml.html#NT-Nmtoken>

[4] NameChar ::= Letter | Digit | '.' | '-' | '_' | ':' | CombiningChar
| Extender
<http://www.w3.org/TR/REC-xml.html#NT-NameChar>
--
Johannes Koch
In te domine speravi; non confundar in aeternum.
(Te Deum, 4th cent.)