how to set group creation properties on root group?

I would like to be able to set the attr_phase_change property on the root group to force the use of dense attribute storage for attributes on the root group.

Normally one sets this property on a group by first creating a group creation property list, then using H5Pset_attr_phase_change(), and then creating the group.

However, the root group is created automatically when the file is created, and H5Fcreate() doesn't accept a group creation property list to control how that root group is created.

Is there a way I can force the use of dense attribute storage for the root group?

Thanks!

Stephen Pope
stephen.pope@predict.com<mailto:stephen.pope@predict.com>

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