
Version 4.1, released in 2001, added the capability to create XML schemas. Version 3.5 was released in 2000, allowing graphical input for editing diagrams and access to remote files. It is a licensed software product that uses key protection to prevent unlicensed usage. XMLSpy was first released in 1999, producing an integrated development environment for XML.

XMLSpy allows developers to create XML-based and Web services applications using technologies such as XML, JSON, XBRL, XML Schema, XSLT, XPath, XQuery, WSDL and SOAP.

XMLSpy is a proprietary XML editor and integrated development environment (IDE) developed by Altova.
