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DITA Introduction
In this section, DITA and the technologies in the background are explained.
Simple project hierarchy
A DITA project usually contains a DITA Map with multiple <topicref> elements that reference DITA Topics.

DITA Introduction
In this section, DITA and the technologies in the background are explained.
- What is XML?
  DITA is based on the Extensible Markup Language (XML). XML is a meta-language for creating new languages. To understand what DITA is, it is important to understand what XML is and how it works.
- What is DITA?
  This section explains the basic principles of DITA.
- The History of DTA
  This is a short summary of the DITA history. The detailed history can be looked up at http://dita.xml.org/book/history-of-dita.
- Simple project hierarchy
  A DITA project usually contains a DITA Map with multiple <topicref> elements that reference DITA Topics.
- Why using DITA?
  This section lists benefits of DITA.
- Who is using DITA
  This list shows the companies who voted for the DITA 1.3 specification.
- DITA at SAP
  SAP presented their worldwide DITA environment at the DITA-OT-Day 2016 in Munich/Germany.

Simple project hierarchy

A DITA project usually contains a DITA Map with multiple <topicref> elements that reference DITA Topics.

Sample project: simple-project-hierarchy.zip

DITA Map with some topic references

The following DITA Map example shows a very simple map structure with a few topics.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE map PUBLIC "-//OASIS//DTD DITA Map//EN" "map.dtd">
<map>
    <title>Map</title>
    <topicref href="topics/topic-01.dita"/>
    <topicref href="topics/topic-02.dita">
        <topicref href="topics/topic-02-01.dita"/>
    </topicref>
    <topicref href="topics/topic-03.dita"/>
</map>

Note: It is possible to nest DITA Maps in DITA Maps using the <mapref> element.