The reference pages in this section describe each of the parameter entities used in DocBook. This information is most useful when you are writing a customization layer.
In the print version of this book, these reference pages provide only a brief summary of the function of each broad family of parameter entities. There are nearly 2,000 parameter entity declarations in DocBook, and displaying long lists of parameter entity names on paper seemed wasteful. The online version provides more detailed, hyperlinked information about each parameter entity family.