These parameter entities offer a place where you can easily add new elements to the DocBook classes.
Each of the local class parameter entities is defined as empty by default in DocBook.
| %local.admon.class; | %local.appendix.class; | %local.article.class; | 
| %local.base.char.class; | %local.book.class; | %local.chapter.class; | 
| %local.compound.class; | %local.descobj.class; | %local.docinfo.char.class; | 
| %local.formal.class; | %local.gen.char.class; | %local.genobj.class; | 
| %local.index.class; | %local.informal.class; | %local.inlineobj.char.class; | 
| %local.linespecific.class; | %local.link.char.class; | %local.list.class; | 
| %local.nav.class; | %local.ndxterm.class; | %local.notation.class; | 
| %local.other.char.class; | %local.otherinfo.class; | %local.para.class; | 
| %local.refentry.class; | %local.synop.class; | %local.tech.char.class; | 
| %local.xref.char.class; | 
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