Sample xml file:
<?xml version="1.0" ?>
<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.docbook.org/xml/4.2/docbookx.dtd">
<article>
<title>Test article</title>
<para>Test paragraph</para>
</article>
Assuming you have successfully parsed and loaded the xml file into a Document object, you can access the Document Type using the DocumentType object.
Document doc;
...
// assume that the doc has been created above.
DocumentType doctype = doc.getDoctype();
System.out.println("doctype.getPublicId(): " + doctype.getPublicId());
System.out.println("doctype.getSystemId(): " + doctype.getSystemId());
System.out.println("doctype.getName(): " + doctype.getName());
The output of the above program would be:
doctype.getPublicId(): -//OASIS//DTD DocBook XML V4.2//EN
doctype.getSystemId(): http://www.docbook.org/xml/4.2/docbookx.dtd
doctype.getName(): article