Do you need a visual XML schema editor in NetBeans IDE 7.0.1? Here's how:
You'll see a multiview editor with visual support for editing XML schema files:
Note, however, that the XML schema editor is part of the archived SOA Tools, so you can't file issues against this tool, since there is no longer support for it. Still, it seems to work fine, at least, on first trying it, so give it a try.