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rfc20: reserve leading + for instance-local properties #545

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rfc20: reserve leading + for instance-local properties #545

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9 changes: 9 additions & 0 deletions spec_20.rst
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Expand Up @@ -194,6 +194,15 @@ R Format
result in both ``amd-mi50@gpu`` and ``amd-mi50`` being valid properties
for resources in the instance.

A leading ``+`` character marks an *instance-local* property: one that
describes the containing instance rather than an attribute of the
hardware, for example a property derived from queue membership. The
literal property SHALL apply to the defined execution target ranks as
usual. Because instance-local properties describe the instance and not
the resources themselves, a scheduler SHALL omit them from the *R* it
generates to allocate resources to a job. Other components that
generate an *R* subset MAY likewise omit them.

.. data:: starttime

(*number*, OPTIONAL) The start time at which the resource set is valid.
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