---
title: "map-filename-lower-case"
description: "## Syntax **map-filename**(filename) **map-filename-words**(filename) **map-filename-lower-case**(filename) filename name of the file ## Purpose The map filename annotations are used to create nested DITA maps. DITA allows you to physically split a map into separate files. The map file name annotations are…"
url: "https://www.stilo.com/docs/migrate/book/map-filename-lower-case/"
updated: "2021-04-25"
category: Annotations / Book, Map and Bookmap
tags:
  - Annotations
---

# map-filename-lower-case

## Syntax

**map-filename**(filename)

**map-filename-words**(filename)

**map-filename-lower-case**(filename)

filename

name of the file

## Purpose

The map filename annotations are used to create nested DITA maps. DITA allows you to physically split a map into separate files. The map file name annotations are used to pin point where a new physical DITA map should start, and what its file name should be.

Typically, this annotation is applied on elements which have also had a title annotation applied.

The variations of the map file name annotations apply different filtering logic to the file name parameter. Consider the text "vegetable recipes":

| annotation | description | computed file name |
| --- | --- | --- |
| map-filename(\\\*.ditamap) | no filtering | vegetable recipes.ditamap |
| map-filename-lower-case(\\\*.ditamap) | lower case text | vegetable recipes.ditamap |
| map-filename-words(\\\*.xml) | replace funny charaters with an underscore | vegetable_recipes.xml |

The \\\* syntax is used within annotations to reference the full text of the current element. In the scenarios above, we can imagine that there is a paragraph element with content "vegetable recipes".