tr example::keg:1.0 { 

#specify profiles that apply for all the sites for the transformation 
#in each site entry the profile can be overriden 

  profile env "APP_HOME" "/tmp/myscratch"
  profile env "JAVA_HOME" "/opt/java/1.6"

  site isi {
    profile env "HELLo" "WORLD"
    profile condor "FOO" "bar"
    profile env "JAVA_HOME" "/bin/java.1.6"
    pfn "/path/to/keg
    arch "x86"
    os "linux"
    osrelease "fc"
    osversion "4"
      
    # installed means pfn refers to path in the container.
    # stageable means the executable can be staged into the container
    type "INSTALLED" 

    #optional attribute to specify the container to use
    container "centos-pegasus"
  }
}

cont centos-pegasus{
     type docker

     # URL to image in a docker hub or a url to an existing docker
     # file exported as a tar file
     image "/URL/" 

     # optional site attribute to tell pegasus which site tar file
     # exists. useful for handling file URL's correctly
     image_site "optional site"
  
     # a url to an existing docker file to build container image  from scratch
     dockerfile "/URL"

     # specify env profile via env option do docker run
     profile env "JAVA_HOME" "/opt/java/1.6"	    
}