Re: Caching paragraph, #issue-html-nsdoc

Ok Harry, how's the extra sentence at the end here :

[[
Transformation Caching
It can be useful for GRDDL aware agents to maintain a local cache of
material relating to GRDDL transformations to avoid unnecessary HTTP
requests. A typical case would be for namespace documents which rarely
change (and/or may not have an associated GRDDL transformation). This
caching may extend far beyond document expiry times provided by the server.
Where this is the case, care should be taken to ensure that the cached
information is current, to avoid systematic misinterpretation of published
data. Ideally implementers of GRDDL aware agents will allow any local
caching to be disabled. When caching  is not present, the namespace document
of a source document should be retrieved and checked for the presence of
GRDDL transformations.
]]

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