The application specific information portion of the SGML declaration is used to specify any application specific information that might be needed or wanted. The use of this specification is growing, until recently I have not seen any examples where any information was provided in this section. HyTime uses this area to specify a starting point (a "bootstrap") for the names that it uses. It is also being used more frequently to specify prefixes on processing instructions and SDATA for particular processing systems. I expect its usage to continue to grow.
The following example shows the most commonly used specification for application specific information; that is, that there is no information specified: