Application folders are prefixed with "A_"; module folders are prefixed with "M_"; class path component and result folders are prefixed with "C_".

A typical application folder:

  wlp/usr/servers/annoFat_server/
    workarea/org.eclipse.osgi/43/data/anno/A_TestServlet40/
      C_%2FTestServlet40.war/
      C_%2FTestServlet40.war%2FWEB-INF%2Flib%2FTestServlet40.jar/
      C_%2FTestServlet40.war%2FWEB-INF%2Flib%2FTestServletA.jar/
      C_%2FTestServlet40.war%2FWEB-INF%2Flib%2FTestServletB.jar/
      C_%2FTestServlet40.war%2FWEB-INF%2Flib%2FTestServletC.jar/
      C_%2FTestServlet40.war%2FWEB-INF%2Flib%2FTestServletD.jar/
      M_%2FTestServlet40.war/

A typical module folder:

  wlp/usr/servers/annoFat_server/
    workarea/org.eclipse.osgi/43/data/anno/A_TestServlet40/
      M_%2FTestServlet40.war/
        C_excluded/
        C_partial/
        C_seed/
        containers - Data for module class path components
        classes - Overal module class data
        resolved - Classes resolved within the module
        unresolved - Classes referenced but not resolved by the module
        queries - Log of queries made against module data

A typical container folder:

  wlp/usr/servers/annoFat_server/
    workarea/org.eclipse.osgi/43/data/anno/A_TestServlet40/
      C_%2FTestServlet40.war/
        stamp - Component size and last modified times
        classes - Component class data
        targets - Component annotation targets data

File contents vary by type.  For example, a "targets" file, which contains annotation targets data, has a listing of classes and class annotation targets:

# ============================================================
Encoding: UTF-8
Table: Annotation Targets
Version: 1.0
Written: Mon, 28-Jan-2019 13:38:49 -0500
# ============================================================
# Package Annotation Targets:
# ============================================================
# Class Annotation Targets:
Class: testservletd.jar.servlets.ServletContainerInitializer_D
  Class Annotation: javax.servlet.annotation.HandlesTypes
Class: testservletd.jar.servlets.ServletD
  Class Annotation: javax.servlet.annotation.WebServlet
# ============================================================