[Laszlo-dev] Implicit replication, <view> datapath property, and, <datapath> xpath property

[André Bargull]

But you need to consider, that the constraint does not apply to a 
replication-manager in every case! If the xpath-expression points to a 
single node, replication isn't triggered and therefore no 
replication-manager will be created. If you just replace all constraint 
datapaths with explicit replication, many programs will break, because 
people don't expect to get a replicator-node in this cases.

> Delving into making constraints class methods, we have some tag- 
> compiler work to do.
>
> Apparently you can say:
>
>    <view datapath="${...}" />
>
> or:
>
>    <view>
>      <datapath xpath="${...}" />
>
> In both cases, the constraint really applies to the (invisible)  
> replication manager, not to the view or the datapath.  Right now this  
> constraint is picked up at run time, ripped off the clone template and  
> smashed onto the replication manager.  That is not going to work in  
> modern (JS2) runtimes.
>
> I think the right approach here is to have the tag compiler re-write  
> implicit replication into explicit replication, so:
>
>    <view datapath="${...}" />
>
> becomes:
>
>    <replicator datapath="${...}">
>      <view />
>    </replicator>
>
> etc.
>
> Does this seem feasible?  Could we even spit out a deprecation warning  
> suggesting that explicit replication be used?