Ant condition block -

i have ant condition this:

   <condition property="create_stub">     <and>       <available file="${create_stub_command_file}" property="stub_script.present" />       <isset property="packaged_stub_file"/>     </and>    </condition> 

my understanding is: if create_stub_command_file present set stub_script.present=true. not sure

<isset property="packaged_stub_file"/> 

what doing? , how change overall condition. i.e in case condition block evaluate true?

equivolent pseudo code:

if (file($create_stub_command_file).exists)    property["stub_script.present"] := true end   if (file($create_stub_command_file).exists , property["property["stub_script.present"] != null)    property["create_stub"] := true end  

forgive errors... find condition blocks tricky , need lots of testing. you're best advised keep them simple. ant not programming language.