SDF 2.000: SDF Reference: restrict Macro

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# 6.35. restrict Macro

## Interface

The general syntax is:

      !restrict name

The arguments are:

Name | Type | Default | Rule
name | string |  |

See Understanding Macro Interfaces, if necessary.

## Description

The restrict macro declares a restricted family of variables. If a variable begins with a restricted prefix, then it must be declared via the define filter.

This feature aims to catch errors caused by authors using a bad variable name. For example, if an author types

       !define DOC_NAMe "My Document"

but meant to type

       !define DOC_NAME "My Document"

then an error will be raised as DOC_NAMe is an unknown variable within the DOC family.

## Examples

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