Documentation for JIRA 4.4. Documentation for other versions of JIRA is available too. 
Please be aware: The build.xml file is an Ant file, which when invoked with the build.sh / build.bat script, will construct deployable web application archive (.war) files (for supported application servers). The build.xml file copies the contents of the webapp subdirectory of your JIRA Installation Directory and overwrites it with the contents of the sibling edit-webapp directory, when constructing its .war files. Thus, never edit files within this webapp directory!
If a file needs editing, first copy it from webapp/path/to/file to edit-webapp/path/to/file subdirectories of your JIRA Installation Directory and edit it in the latter location.
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