Lots of
xml editors are available in the market. Some are free and some are
commercial. A simple search using a good search engine would provide
you links to a lot of products in this category.
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There are
websites that list all the types of xml editors available in the market
along with the type of license.Some of the best xml editors allow visualizing
the xml file or the schema as a diagram and editing it. You can either
edit in the diagram or in the code.
Both the
views are given in the editor.Keep in mind that the best xml editors
should help you to increase your productivity and should be easy to
use.
Basic features,
like ability to work with multiple files, checking for well-formedness
of the xml document, validating an xml document against a DTD or Schema,
color coding of syntax, code completion, and documentation for help
are available in most of the xml editors.