The Stylus Studio DTD Editor lets you visually develop Document Type Definitions (DTD) to structure XML documents. The DTD Editor also includes tools and utilites for validating XML against DTD's, converting DTD's, and generating DTD's.

The XMLSpy DTD editor includes an XML to DTD converter that invers a valid DTD based on one or more XML instance documents. You can also generate a sample XML document based on your DTD.

Liquid Studio provides a Data Type Definition (DTD) Editor making it possible to easily create, edit and validate DTD files. Features of the DTD Editor include Validation, DTD Syntax Highlighting and Multi-step undo/redo.

Free XML Validator to edit, beautify and validate XML online. XML validation covers syntax check and schema validation (XSD + DTD).

DTD Editor. EditiX is a powerful and easy to use DTD editor for Windows, Linux and Mac OS X designed to help web authors and application programmers take advantage of the latest XML and XML-related technologies. All features . Helpers on DTD syntax ; Helpers on DTD elements; Helpers on DTD attribute types

You can use the DTD editor to perform a variety of tasks such as creating, editing, and deleting DTD elements, attributes, entities, notations, and comments. Before you can perform any of these tasks, you must create a DTD and open it in the DTD editor.

Use Arbortext Architect to customize the Arbortext Editor authoring environment in the following ways: • Create a customized document type for authoring documents. • Create a new document-type definition (DTD) or XML Schema.

Design DTDs easily and intuitively with a built-in DTD Editor! The DTD Editor lets you work with text and tree views to review and modify DTD elements, attributes, and properties. Validate XML using any DTD processor (MSXML, Microsoft .NET, Xerces, and others)!

With a DTD, independent groups of people can agree to use a standard DTD for interchanging data. With a DTD, you can verify that the data you receive from the outside world is valid. You can also use a DTD to verify your own data.

You can edit DTDs in the following ways: Create or remove elements, attributes, entities, notations, and comments; Edit an element's content model; Edit a group; Reuse entities; Editing in the Outline view. The Outline view will show you all the items in your DTD as you add them. In this view, you can both create and delete DTD nodes.