Extension for material properties?

[Philippe Hurbain]

We already have a material start/end meta (sort of), it's called the texture extension.
It just needs some changes to make it work with in a different mode.
Maybe introduce a new meta name which is backwards compatible with the texture one. So parsers don't need to support jet another begin/end/next mechanism.  They would only need to disable part of it's parameter handling etc when the meta is called texture instead of e.g. 'material'

Then there is a need for some nesting, which is currently excluded from texmap specification: eg. we need to be able to apply texmap pattern on grainy slopes (BTW, what happens in various implementations if we try to apply texmap on something containing a subpart itself texmapped?)

Speaking of materials, we still don't have satisfying way to use texmap patterns containing metallic inks...