Patent on XML?

Cnet has a story about how a small company is claiming via US patents 5,842,213 and 6,393,426 filed in 1997 that they own the rights to XML and intend to ‘monetize’ it.

How did this ever get approved? Did no one in the US Patent Office know of SGML? When I was working at the Environmental Protection Agency in the late 80’s there was a fair amount of EPS-generated documentation that existed in SGML. This definately can’t stand up to the ‘prior art’ challenge.

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