We are developing an application that involves a substantial amount of XML transformations. We do not have any proper input test data per se, only DTD or XSD files. We\'d li
Microsoft Office has 'InfoPath', which takes an XSD as an import and lets you quickly and easily define a form-based editor for creating XML files. It has two modes - one where you define the form, and another mode where you create the XML file by filling out the form. I believe it first came with Office 2003, and most people never install it. It shocks me at how much I like it.