On Mon, 15 Mar 2010, John Peterson wrote:

> Mesh generators don't have to write anything extra.  If there are no
> attributes, libmesh doesn't assign any particular value to subdomain
> IDs, or it assigns the block id, at your discretion.

I'd say read in the block id by default if we encounter a mesh that
doesn't have the libMesh_subdomain_id attribute.  That way we keep
compatibility with mesh generators and existing files without anyone
having to change user code.
---
Roy

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