Oct 9, 2009 · I have googled this question, but I do not understand clearly what is an XML schema and DTD (document type definition), and why the XML schema is more powerful compared to DTD. Any guidance would...

Oct 31, 2021 · To take one example <!ELEMENT master (big, small+)*> means that a valid master element has a content that consists of a sequence of zero or more groups, where each group contains one element named big followed by one or more elements called small. Google for "XML DTD tutorial" and you will find plenty of more detailed explanations.

Feb 16, 2012 · I have used DTD several times in my document, but I never knew its significance. I have also tried to understand W3Schools tutorial of DTD. But I found it too theoretical. What is the significance of DTD exactly, and why are type definitions are so important?

Could anyone specify what is the need and use of the Document Type Declaration in HTML pages. What is the advantages of it? I searched through the Net and found the results to be little bit confusi...

Oct 30, 2017 · Any conforming XML parser can be used to check that a DTD conforms to the rules in the XML spec (which is, I assume, what you mean by 'valid' -- DTDs cannot be valid in the sense defined in the XML spec because they aren't XML document instances. Open-source XML validators include xmllint (built on libxml), rxp, and Xerces.

DTD is an SGML and XML thing. An XML DTD is even more limited in expressive power than an SGML DTD; XML is a simplification of SGML in this area, too.

Jun 11, 2013 · A Doctype describes which DTD the XML file follows. This: Describes what elements are allowed inside what other elements (for the purpose of validation) Describes what named character references are available (beyond the …

Apr 7, 2011 · The other answers here are either incomplete or incorrect, the main misconception is that The standalone declaration is a way of telling the parser to ignore any markup declarations in the DTD. The DTD is thereafter used for validation only. standalone="yes" means that the XML processor must use the DTD for validation only.

May 16, 2012 · The DTD was provided partly for bootstrapping (when initial drafts of XSD came out, DTDs were already widely supported) and partly for comparison purposes (to help DTD-savvy readers understand the schema for schema documents).

In a DTD, the type of an attribute that contains text must be CDATA. The CDATA keyword in an attribute declaration has a different meaning than the CDATA section in an XML document.