<META NAME="MyConcatenatedMetaData" CONTENT="First 1024 characters ...">
<META NAME="MyConcatenatedMetaData" CONTENT="Second 1024 characters ...">
..
etc.
or
<META NAME="MyExternalMetaData" CONTENT="URL:http://meta.com/mymeta.meta">
etc.
If you want to change META to become a container (or supply some other tag
to serve this purpose), then, if it is to be truly meta data, you aren't
going to be able to use anything other than declared content of CDATA, or
perhaps a #PCDATA model in any case. Using one or more CONTENT attributes
to store the meta data would be close to #PCDATA (actually closer to
RCDATA); using external meta content would be closer to CDATA (actually
closest to NDATA).
Glenn