"[T]he world has become very excited about a new technology: XML." - Eric Evans, 2004 #readingToday

Recently, the world of e-commerce has become very excited about a new technology: Extensible Markup Language (XML) promises to make interchange of data much easier. A very valuable feature of XML is that, through the document type definition (DTD) or through XML schemas, XML allows the formal definition of a specialized domain language into which data can be translated. Industry groups have begun to form for the purpose of defining a single standard DTD for their industry so that, say, chemical formula information or genetic coding can be communicated between many parties. Essentially these groups are creating a shared domain model in the form of a language definition.

Domain-Driven Design, Eric Evans