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notes on children and recursion

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Richard van der Hoff 2020-11-10 12:08:29 +00:00
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proposals/1772-groups-as-rooms.md
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@ -141,6 +141,9 @@ relationship can be expressed in one of two ways:
events unless their sender has a sufficient power-level to send an events unless their sender has a sufficient power-level to send an
`m.room.child` event in the parent. `m.room.child` event in the parent.
Where the parent space also claims a parent, clients can recursively peek
into the grandparent space, and so on.
This structure means that rooms can end up with multiple parents. This implies This structure means that rooms can end up with multiple parents. This implies
that the room will appear multiple times in the room list hierarchy. that the room will appear multiple times in the room list hierarchy.
@ -156,30 +159,22 @@ include:
advertised as part of a given space, but *does* want the room to form part advertised as part of a given space, but *does* want the room to form part
of the hierarchy of that space for those in the know. of the hierarchy of that space for those in the know.
### Sub-spaces Cycles in the parent->child and child->parent relationships are *not*
permitted, but clients (and servers) should be aware that they may be
XXX: Questions to be answered here include: encountered, and ignore the relationship rather than recursing infinitely.
* Should membership of a sub-space grant any particular access to the parent
space, or vice-versa? We might need to extend `m.room.history_visibility` to
support more flexibility; fortunately this is not involved in event auth so
does not require new room versions.
* What happens if somebody defines a cycle? (It's probably fine, but anything
interpreting the relationships needs to be careful to limit recursion.)
### Default children ### Default children
The `default` flag on a child listing allows a space admin to list the The `default` flag on a child listing allows a space admin to list the
"default" sub-spaces and rooms in that space. This means that when a user joins "default" sub-spaces and rooms in that space. This means that when a user joins
the parent space, they will automatically be joined to those default the parent space, they will automatically be joined to those default
children. XXX implement this on the client or server? children.
XXX implement this on the client or server?
Clients could display the default children in the room list whenever the space Clients could display the default children in the room list whenever the space
appears in the list. appears in the list.
XXX: do we need force-joins, where users may not leave a room they autojoined?
### Long description ### Long description
We would like to allow spaces to have a long description using rich We would like to allow spaces to have a long description using rich