[DocBook] binary imagedata

[Jerome]

Hi,
I would like to know if there is a trick to use inlined raw data (encoded in
base64 for example) to describe the content of an imageobject. I tried the
following code, but i don't know how to describe the matching ENTITY.

<!ENTITY ps_entity "how could i encode my ps file ???" >
....

<mediaobject>
<imageobject>
<imagedata entityref = "&ps_entity" format="PS" />
</imageobject>
</mediaobject>

Thanks for help !!

Jerome