The DITA-OT requires the following software applications:

JRE or JDK, version or later

Provides the basic environment for the DITA-OT. You can download the Oracle JRE or JDK from . If you opt to use the full-easy-install package, this is the only prerequisite software that you need to install.

Ant, version or later

Provides the standard setup and sequencing of processing steps. You can download Ant from .

XSLT processor

Provides the main transformation services. It must be compliant with XSLT 1.0. The DITA-OT is tested with both Saxon and Xalan-J. You can download Saxon, version from and Xalan-J, version or later from .

Depending on the type of output that you want to generate, you might need the following applications:

ICU for Java

Does the DITA-OT only use ICU for Java for index processing? Index processing is what is explicitly mentioned in the installing topics.ICU for Java is a cross-platform, Unicode-based, globalization library. It includes support for comparing locale-sensitive strings; formatting dates, times, numbers, currencies, and messages; detecting text boundaries; and converting character sets. You can download ICU for Java from .

Microsoft Help Workshop

Required for generating HTML help. You can download the Help Workshop from .

XSL-FO processor

Required for generating PDF output. You can download FOP from ; you also can use Antenna House Formatter or RenderX.

See Tested platforms and tools for detailed information about versions of the prerequisite applications that have been tested with the current DITA-OT release.