W3C home > Mailing lists > Public > public-ldp-wg@w3.org > November 2013

optimizing container pages serialization to enable streaming

From: Eric Prud'hommeaux <eric@w3.org>
Date: Mon, 11 Nov 2013 12:48:54 -0500
To: Linked Data Platform WG <public-ldp-wg@w3.org>
Message-ID: <20131111174801.GE4081@w3.org>
During the call, I asserted that seeing
  <ContainerX> ldp:membershipRule [];
with default properties assumed for the blank node doesn't prevent
future non-monotonic assertions (e.g.
  Class: <ContainerX>
      SubClassOf: (
          ldp:membershipRule some (
              ldp:insertedContentRelation some foo:bar))
). While strictly true, the issue here is not monotonicity but
pragmatic ordered serialization to enable a client to interpret
the data as it arrives. Let's call that "streaming".

To Henry's point, we could enable streaming and enable defaults by
adding a ldp:membershipRule along with a change to 5.3.1 (and tweaks
to the pending mods to Membership triples):
 s[[
5.3.1 The representation of a LDPC MUST contain a set of membership
triples following one of the consistent patterns from that
definition. The membership-constant-URI of the triples MAY be the
container itself or MAY be another resource (as in the example).  See
also 5.2.3.
]][[
5.3.1 The representation of a LDPC MUST contain exactly one
ldp:membershipRules statement with the subject of the
membership-constant-URI and an object a blank node. All membership
triples use this blank node as the subject. The
membership-constant-URI of the triples MAY be the container itself or
MAY be another resource (as in the example).  See also 5.2.3.
]]

Observant readers of the spec will probably notice that it'd be wise
to serialize this at the beginning of the page, but we can point that
out in informative text under 5.3.1, in the primer, or both.

The downside is that membership triples really aren't about the blank
node but instead about the membership-constant-URI which has a
ldp:membershipRule relationship to the blank node. Also, bnodes freak
some people out, but that's probably pretty managable.

-- 
-ericP

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Received on Monday, 11 November 2013 17:49:26 UTC

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