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Re: Can one inline schema import definitions from a second inline schema?

From: Amelia A. Lewis <alewis@tibco.com>
Date: Mon, 20 Oct 2003 13:41:43 -0400
To: Sanjiva Weerawarana <sanjiva@watson.ibm.com>
Cc: www-ws-desc@w3.org
Message-id: <20031020134143.3748afb2.alewis@tibco.com>

On Mon, 20 Oct 2003 23:26:47 +0600
Sanjiva Weerawarana <sanjiva@watson.ibm.com> wrote:
> Obviously I didn't understand it then and I don't understand it now.
> Why do we say that imported components are not available to WSDL? In
> general, why do we go saying things about other people's specs??

We don't.  Schema says this.  We follow schema, pretty much, in defining
visibility of our imports.  An import can only be seen by its importing
container; that importing container cannot "export" it.  The importing
container can only "export" the bits that it defines for itself.  The
rule of thumb is that there's a one-level horizon for imports.

> Also, isn't the replacement really
>     <xs:schema><xs:include .../></xs:schema>

Ah, this is different.  An included schema is different, so that would
work, and would be visible.  So, sure, we could disallow xs:import as
the immediate child of wsdl:types, and instead require that xs:schema
contain an xs:include in order to incorporate an external schema
definition.  Rather more verbose, but perfectly plausible.  There are
some potential problems, in that xs:include does not have a namespace
attribute; it is almost solely identifiable by its schemaLocation
attribute, which may cause problems for folks using catalog-enabled
systems.  The targetNamespace issues for inclusions are also perhaps a
little more tricky than we would really want to encourage people to have
to mess with as a general thing.  Overall, allowing xs:import as an
immediate child of wsdl:types seems an awfully reasonable solution, as
it is far easier to understand what the intended semantic is supposed to
be, and it is also easier to get the syntax correct.

Amelia A. Lewis
Architect, TIBCO/Extensibility, Inc.
Received on Monday, 20 October 2003 13:41:43 UTC

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