I have to tell you, I nearly gave up looking for an XML Editor that edited XML like a spreadsheet. I was 10 minutes away from starting a new project. Having said that, you should consider using a similar business model as HeidiSQL. You have something that is as useful to me as HeidiSQL. I would presume that many others have tried, and failed to find a product like yours. Again, you might consider going to a more open, donation style method for XMLFox. Thanks again for this incredibly useful product!
XMLFox Advance translates XML data to Excel spreadsheet format where it can be edited, printed, and saved as required in MS Excel interface. Because XMLFox Advance was designed to be a smart one click solution it does not require XML, DTD, XSD Schema expertise or other XML specific knowledge. In XMLFox Advance you can output data to several other data format files. The Editor allows you export XML tables or whole XML to the following data files: TXT; convert into JSON, csv (Comma Separated Value) file, convert into HTML page, create MS Access database, upload XML to SQL Server database, XML to PDF, and create Excel file.
To be appropriate to various users, an XML file has to conform to a standardized structure. XML XSD Schema is an XML-oriented representation of the structure of an XML document. XML XSD Schema has the power of possibility to provide the standard structure for XML attributes and elements, through its support for namespaces and datatypes. You have to validate your XML file to make sure it fits to your application's needs to prevent any exception in your code. To check if your XML document conforms to an XSD Schema, the document must be validated against that XSD Schema.