%*.hook; Parameter Entities
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This is an alpha version of this book.

# `%*.hook;` Parameter Entities

## Name

`%*.hook;` Parameter Entities — Control access to additional modules

##

# Synopsis

The hook parameter entities provide a mechanism for including additional modules (EBNF, MathML, HTML Forms, etc.). Each of these hooks exists so that the module can insert additional content in appropriate places without interfering with the normal user-level customization provided by the local.* entities.

## Description

The following sections identify all of the hook parameter entities in DocBook.

### %ebnf.block.hook;

Parameter entity content:

    |productionset|constraintdef

### %ebnf.inline.hook;

Parameter entity content:

    |nonterminal

### %forminlines.hook;

Parameter entity content:

The replacement text for this entity is empty.

### %forms.hook;

Parameter entity content:

The replacement text for this entity is empty.

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