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Ant doesn't defined the notion of module.

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Directory Structure

! See Search for Directory Structures

modulename
  |-- src/
  |-- test/
  |-- etc/
  |-- target/
 build.xml

where:

• src is the directory that contains the source code
• test is the directory that contains the test code
• etc is generally a directory reserved for configuration file. See als Linux - /etc/ directory (Configuration)
• target is the directory where all generated files during the build process will be saved (The directory name is borrowed from Maven)