Last week Altova released the latest version of its XML editor, XMLSpy 2009. The newest version boasts support for XBRL standards and also includes a XBRL Taxonomy Editor. It is offered as a stand-alone product or part of the Altova MissionKit. You can download a free 30-day trial at Altova.com [1]. Press release [2]
Links:
[1] http://www.altova.com/download.html
[2] http://www.fiercecio.com/press-releases/altova-xmlspy-2009-extends-its-functionality-adding-support-xbrl-and-more