Hi,
 

I got a problem with converting SGML DTD to XML DTD. In the converted XML DTD, I have the below entity definition:

 

 

In the element Graph,

 

 

But this XML DTD is not valid since I got the following error message in XML Spy like:

 

Entity substitutin failed!

Well-formedness violation: character '(' is grammatically unexpected in the column 18 at line 1.
 

I know the problem is definitely caused by #PCDATA, but I don't know how to convert (I tried different ways but with no luck)?

 

I appreciate any comments.

syt