Any
standard xml editor and viewer would display using different color coding
for the elements, the attributes and the values in an xml document.
The well-formedness of an xml document will be checked automatically.
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If
you could link a schema or a dtd to the xml document then you can validate
that xml document against that schema or dtd. Feature to edit the schema
is also available in such products.
Most
of the leading products allow you to work on the xml style sheet files
too. You can create style sheets for your xml document and also transform
them into other forms like xml, html, and others.
Creating
an instance of an xml document from the schema or a dtd and creating
a dtd or schema from the xml document are possible with such editors.
Different
views of the xml document, schema, and the xsl files are available.
Graphical view, code view, and tree view are some of the common views
that you can expect in such products.
If you select an element in the graphical view the corresponding code
is also selected in the code view. You can have a look at the different
views in different tabs and windows.