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# 5.24. plain Filter

## Interface

The general syntax is:

      !block plain
      ...
      !endblock

See Understanding Filter Interfaces, if necessary.

## Description

The plain filter is used when including a topic as an "plain" section within a document, i.e. normal headings are converted to plain headings.

## Examples

A typical book might look like this:

    !init OPT_STYLE="manual"

    !define DOC_NAME "A Sample Book"
    !build_title

    !include "chapter1.sdf"
    !include "chapter2.sdf"
    !include "chapter3.sdf"
    !include "glossary.sdf"; plain