This element is present in the DTD but has been deprecated and does not contain any data.
Statutory Invention Registration (SIR) flag.
If this flag is present, the value of the sir-text attribute shall be rendered on the front page of the patent grant publication: "A statutory invention registration is not a patent. It has the defensive attributes of a patent but does not have the enforceable attributes of a patent. No article or advertisement or the like may use the term patent, or any term suggestive of a patent, when referring to a statutory invention registration. For more specific information on the rights associated with a statutory invention registration see 35 U.S.C.157."