How to cache portlets from pl/sql pdk

Is it possible to cache portlets from the pl/sql PDK? I've seen a number of threads asking how to prevent the caching, which suggests that it is (and on some installations is standard installations). However, these may not be the same situation that I have.
I have a number of portlets in a pl/sql provider. Although these portlets display dynamic content, the portlet instance on a particular page will always display thee same information - i.e. the information displayed is page-specific.
Therefore I would like to cache each portlet instance. How can I do this?
When I run the page with the _debug=0 parameter, the information shows that the pl/sql portlets cannot be cached.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

Nowadays UTL_FILE_DIR is replaced by Oracle Directory Objects.
Why?
Because:
This parameter can be "*" for all the directories on that disk is a big security hole.
"In the past, accessible directories for the UTL_FILE functions were specified in the initialization file using the UTL_FILE_DIR parameter. However, UTL_FILE_DIR access is no longer recommended. Oracle recommends that you instead use the directory object feature, which replaces UTL_FILE_DIR."
http://docs.oracle.com/cd/E11882_01/appdev.112/e25788/u_file.htm#i996762
And your 'example' will not generate XML in any way,

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