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Now that we have looked at the -- to my knowledge -- only tool for documenting DTDs, let's get started with our own development effort. This can be broken down into the following steps:
We will look at the first step today and leave the others to later installments of this column.
A DTD parser has the job of reading a textual representation of a DTD and transforming it into an in-memory representation suitable for further manipulation in the respective programming language. Instead of writing a DTD parser ourselves, we find these software packages on the Web:
All of these parsers have a straightforward way of calling them on an input stream and creating an internal data structure in return.
With Bourret's parser you simply create a DTDParser
and call either parseXMLDocument() or parseExternalSubset(),
depending on whether the DTD is embedded in the XML document or external to it:
import org.sax.InputSource;
import org.xmlmiddleware.schemas.dtds.DTDParser;
import org.xmlmiddleware.schemas.dtds.DTD;
DTDParser parser = new DTDParser();
InputSource is = new InputSource("html4.dtd");
DTD dtd = parser.parseExternalSubset(is, null);
Parsing DTDs with the other tools...
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Created: Sep 30, 2002
Revised: Sep 30, 2002
