a quick update on my previous response, where I said "any path resolves to
zero or one value only", I really meant that it resolves to zero or one
location in the data graph (that location may of course correspond to a
multi-valued property) .
Kelvin.
On 26/07/07, kelvin goodson <[EMAIL PROTECTED]> wrote:
The SDO 2.1 spec has left the way open for implementations to provide
alternative, "scheme" based means of handling path expressions in SDO calls
that operate on paths paths.
From the spec perspective, each path supplied to such a call belongs to a
scheme, the default scheme being "sdo". To explicitly state the scheme you
prefix the path with "<scheme>:", so dataObject.get("foo") is equivalant
to dataObject.get("sdo:foo");. Note that the default prefix is not
"xpath"; The SDO spec talks of its default path syntax in terms of "an
augmented subset of XPath". With the primary use of this path being the
getting and setting of values, it is important that any path resolves to
zero or one value only.
From the Tuscany perspective we only support the default scheme
currently. I don't have a handle on the fine detail of the XPath 2.0spec, but
I can foresee issues that would probably preclude full XPath
2.0 support via the scheme extensibility feature. It has been suggested in
the spec group that new methods are added to the XSDHelper interface to
handle full XPath support. This discussion is part of the ongoing SDO 3
spec effort.
Kelvin.
On 26/07/07, lizt <[EMAIL PROTECTED]> wrote:
>
> Hi:
> Now SDO doesn't support entire xpath 2.0 spec,I think.
> Can SDO support entire xpath 2.0 spec?
>
> thanks
>
> zhantao li
>
