OpenLaszlo and the W3C
The W3C Web Application Formats Working Group is chartered to develop languages for client-side Web Application development. The first deliverable is "Specification of a declarative format for applications and user interfaces":
This deliverable should be based on an existing application/UI format, such as Mozilla's XUL, Microsoft's XAML, Macromedia's MXML or Laszlo Systems' LZX, provided the owners of the format are willing to contribute. The format should allow embedded program code. This format, combined with the deliverables below and existing technologies including XHTML, CSS, XForms, SVG and SMIL, should provide a strong basis for rich client application development." – emphasis mine








