Encoded File Type Header Field?

[william-silversmith]

We could adapt mapbuffer to add a content type header field. For example:

content_type char(5) = 'draco'

This would allow for automatic decoder selection. On the other hand, we could allow for arbitrary compression types and simply pass through unsupported ones. That would require only a code change and not a format change.

compression_type (4) = "drco"

However, the above change would be generally useful. For example gzip encoded json or xml could be represented.