date:date( ) function date:time( ) function DecisionSoft xmldiff declarations in CSS default namespace declarations defaulted attribute values DefaultHandler class (SAX) defaultss.xsl defs element DeltaXML comparator utility DENG (Desktop Engine) descendant elements diff tools dinosaurs.xml dither.svg dither2svg.xsl dithering scatterplots DocBook 2nd available versions document elements 2nd document entities Document Object Model [See DOM] Document Schema Definition Language [See RELAX NG] document trees Tree Viewer, analyzing with xmllint, exploring with Document Type Definitions [See DTDs]2nd [See DTDs] DocumentBuilder DocumentBuilderFactory DOM (Document Object Model) inspecting and editing XML documents DOM Inspector Element interface methods Java, DOM in minidom (Python) doTime( ) method DSDL [See RELAX NG] DTD generators DTDGenerator Relaxer [See Relaxer] Trang [See Trang] xmlspy [See xmlspy] DTD2XS DTDGenerator DTDs (Document Type Definitions) 2nd 3rd creating from an instance using DTDGenerator using Relaxer using Trang using xmlspy external subsets attribute-list declarations content models element type declarations occurrence constraints SYSTEM keyword text declarations internal subsets XML document validation XML Schema documents, creating Dublin Core project DuBois, Paul