2.2. Optional Tools
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## 2.2. Optional Tools

These applications are not required, but can make working on the documentation easier or add capabilities.

### 2.2.1. Software

JadeTeX, teTeX and Modular DocBook Stylesheets (`print/jadetex`, `print/teTeX` and `textproc/dsssl-docbook-modular`)

  Jade, teTeX and Modular DocBook Stylesheets are used to convert DocBook documents to DVI, Postscript, and PDF formats. The JadeTeX macros are needed to do this.

  If XHTML and plain text output formats are adequate, then this program is not needed and the option to install it from the `textproc/docproj` configuration screen can be disabled.

Vim (`editors/vim`)

  A popular editor for working with XML and derived documents, like DocBook XML.

Emacs or XEmacs (`editors/emacs` or `editors/xemacs`)

  Both of these editors include a special mode for editing documents marked up according to an XML DTD. This mode includes commands to reduce the amount of typing needed, and help reduce the possibility of errors.

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