This last capability is useful for generating a schema after the fact based on a set of XML examples, such as when a throwaway format needs to be formalized. It is also capable of inferring a schema based on a number of XML documents. Internally, it uses the RELAX NG syntax, but it is capable of converting RELAX NG (both the XML and compact syntaxes), DTDs, and W3C XML Schemas. Trang is a multiformat schema converter, originally written by James Clark (one of the authors of the RELAX NG specification). This convertor (see Figure 7-2) enables you to convert between the XML syntax and compact syntax of RELAX NG, as well as convert a DTD into the corresponding RELAX NG schema. In addition to editing RELAX NG schemas, Oxygen includes a graphical interface to the Trang schema converter. Oxygen enables you to edit the schema using either section the other is updated with the changes. In this figure, the central editing area is composed of two parts: the top area is a graphical model of the schema structure, and the lower half is the text of the schema. (RELAX NG compact schemas only allow text-based editing.) Figure 7-1 shows a split screen of the two editors displaying the same schema. You can create RELAX NG schemas in Oxygen using either a text-based or graphical editor. One of the features that make it unique among similar products is its support for RELAX NG schemas (both the XML form and the compact syntax). Two tools that support the creation of RELAX NG schemas are the Oxygen XML editor and Trang.Īs described in Chapter 2, Oxygen is a full-featured XML editor. However, because RELAX NG is now an official OASIS standard, more tools are beginning to add support for RELAX NG. Many of the most commonly used tools were written by the specification authors themselves. RELAX NG has not been available as a standard as long as DTDs or W3C XML Schema, so there are fewer tools available for creating or editing RELAX NG files.

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