We cannot
pinpoint a single product that is only used as an xml dtd viewer. There
are many such products with varying functionalities apart from viewing
the xml dtd files. Almost all the xml editors that are available in
the market can be used for viewing and editing the dtd files.
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XMLSpy
is a leading product for working with xml related files. A feature in
this product enables you to create dtd's from an instance of an xml
document. Similarly the reverse is also possible. You can create an
instance of an xml document from the dtd too.
All the
products used for xml dtd viewing and editing provide syntax coloring
which enables you to identify the different components like elements,
text, values, and attributes of the xml file.
Checking
for the well-formedness of the xml document, validating the xml document
against a schema or dtd, and transforming an xml document according
to the formatting instructions provided in the xsl files are some that
you can expect from any standard xml product.