XDocs was a proposal announced by Microsoft on October 2002 for a forms software, based on XML. Only announcing vague details, it was supposed to help users design, modify and work with XML-based forms, with little or no coding. Unlike the W3C's XForms proposal, Microsoft would control the standard itself, which wasn't well received by the market. It was also a competitor to Adobe Systems's Forms Designer, which uses XML forms as well.
In 2003, Microsoft announced that XDocs was going to be known commercially as Microsoft InfoPath.
References
XDocs Wikipedia(Text) CC BY-SA