On 02/09/2012 03:01 PM, Eric Blake wrote:
> We absolutely cannot reject existing older xml files; but must load them
> with the semantics that make sense.
>
> But a better idea is to represent the XML in a way where the default
> conversion makes sense, but where a user can explicitly change the XML
> to get what they want. I'm thinking:
>
> If offset is 'utc' or 'localtime', we add a new attribute 'adjustment',
> whose value can be either 'reset' to signify that the offset is reset on
> each boot, or a timeDelta, as shorthand for specifying offset='variable'
> adjustment='nnn' basis='utc|localtime'. If the attribute is missing,
> the hypervisor determines whether the default is 'reset' or '0'. Qemu
> would pick 'reset', xend would pick '0'.
>
>
> RNG-wise, this would be:
I missed basis:
>
> <element name='clock'>
> <choice>
> <group>
> <attribute name='offset'>
> <choice>
> <value>localtime</value>
> <value>utc</value>
> </choice>
> </attribute>
> <optional>
> <attribute name='adjustment'>
> <choice>
> <ref name='timeDelta'/>
> <value>reset</value>
> </choice>
> </attribute>
> </optional>
> </group>
> <group>
> <attribute name='offset'>
> <value>timezone</value>
> </attribute>
> <optional>
> <attribute name='timezone'>
> <ref name='timeZone'/>
> </attribute>
> </optional>
> </group>
> <group>
> <attribute name='offset'>
> <value>variable</value>
> </attribute>
> <optional>
> <attribute name='adjustment'>
> <ref name='timeDelta'/>
> </attribute>
> </optional>
<optional>
<attribute name='basis'>
<choice>
<value>utc</value>
<value>localtime</value>
</choice>
</attribute>
</optional>
> </group>
> </choice>
> <zeroOrMore>
> <ref name='timer'/>
> </zeroOrMore>
> </element>
>
--
Eric Blake eblake@xxxxxxxxxx +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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