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From "Andreas Veithen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SYNAPSE-235) Allow XPath expressions to be specified relative to envelope or body via an attribute
Date Wed, 12 Mar 2008 21:06:46 GMT

    [ https://issues.apache.org/jira/browse/SYNAPSE-235?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12578019#action_12578019
] 

Andreas Veithen commented on SYNAPSE-235:
-----------------------------------------

Some comments on the "$transport/Content-Type" proposal:

I think Jaxen doesn't support mixing of different object models in the same XPath expression.
Therefore to support this syntax we would have to construct an AXIOM tree from the transport
headers (and also from the context properties, etc.). Also this kind of information is more
naturally exposed via XPath functions, e.g. "get-property('OperationName')".

There is however a third possibility which is easy to implement and that provides a very elegant
and compact syntax. It takes advantage of the fact that XPath variables also live in namespaces
(i.e. variable names are QNames). If we define a mapping between header names and valid XPath
variable names (e.g. Content-Type <-> contentType), then we could expose transport headers
as XPath variables in a well defined namespace. Assuming that in the config file, this namespace
is bound to the prefix "http", one could then refer to the Content-Type header by writing
"$http:contentType".

> Allow XPath expressions to be specified relative to envelope or body via an attribute
> -------------------------------------------------------------------------------------
>
>                 Key: SYNAPSE-235
>                 URL: https://issues.apache.org/jira/browse/SYNAPSE-235
>             Project: Synapse
>          Issue Type: Improvement
>            Reporter: Asankha C. Perera
>            Assignee: Ruwan Linton
>             Fix For: 1.2
>
>
> This would make XPath expressions simpler without consideration for SOAP 1.1 or 1.2 or
REST etc
> Default could be envelope (i.e. what we have now - for backward compatibility), and an
optional attribute could specify if it should be relative to the body

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