Manual: image descriptor and :data

[Leo]

Hello,

The info (elisp) Image Descriptors) has this:

`:data DATA'
     The `:data' property says the actual contents of the image.  Each
     image must use either `:data' or `:file', but not both.  For most
     image types, the value of the `:data' property should be a string
     containing the image data; we recommend using a unibyte string.

     Before using `:data', look for further information in the section
     below describing the specific image format.  For some image types,
     `:data' may not be supported; for some, it allows other data types;
     for some, `:data' alone is not enough, so you need to use other
     image properties along with `:data'.

This last paragraph is not substantiated by the "'section' below".

I have made AUCTeX preview support tramp and want to find out what types
of images support :data. Thanks.

Leo