Mapper gave me an error when I tried to read a DTD file with DOCTYPE

Question

In Mapper, when setting a schema for an XML type data source, I loaded a DTD file with DOCTYPE in the Load from schema file field and got an error java.lang. IllegalStateException: you should check by canParse* method.
Is this a limitation of using DTD files with HULFT Square?

Answer

The error occurs because DOCTYPE specifies the DTD for that XML document and cannot be included in a DTD file. This error is not based on HULFT Square's own specification, but on the specification established in XML 1.0.
If you use Mapper and use a DTD file to set the schema for an XML type data source, please do not use DOCTYPE.