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What are single, non-primary, output ports?

From: Philip Fennell <Philip.Fennell@marklogic.com>
Date: Fri, 8 Oct 2010 00:18:41 -0700
To: "xproc-dev@w3.org" <xproc-dev@w3.org>
Message-ID: <D20C296D14127D4EBD176AD949D8A75A44262A21@EXCHG-BE.marklogic.com>
As taken from the current recommendation, XProc defines the following four steps (p:compare, p:parameters, p:store and p:xsl-formatter) as having a single output port (result) that is also not the primary output port.

I may not have found the whole story but according to the recommendation:

'The primary attribute is used to identify the primary output port. An output port is a primary output port if primary is specified with the value true or if the step has only a single output port and primary is not specified. It is a static error (err:XS0014) to identify more than one output port as primary.'

However, what it doesn't explain is what is meant by a single output port that isn't a primary output port. I can see that, conceptually, the primary result of both p:store and p:xsl-formatter is the document written to the URI declared in the href attribute and not what appears on the output result port but I'm not sure of the practicle implications of such a declaration.




<p:declare-step type="p:compare">
    <p:input port="source" primary="true"/>
    <p:input port="alternate"/>
    <p:output port="result" primary="false"/>
    ...
</p:declare-step>


<p:declare-step type="p:parameters">
    <p:input port="parameters" kind="parameter" primary="false"/>
    <p:output port="result" primary="false"/>
</p:declare-step>


<p:declare-step type="p:store">
    <p:input port="source"/>
    <p:output port="result" primary="false"/>
    ...
</p:declare-step>


<p:declare-step type="p:xsl-formatter">
    <p:input port="source"/>
    <p:input port="parameters" kind="parameter"/>
    <p:output port="result" primary="false"/>
    ...
</p:declare-step>



Regards

Philip Fennell 
Consultant
MarkLogic Corporation

Mobile +44 (0) 7824 830 866

email  Philip.Fennell@marklogic.com
web    www.marklogic.com


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Received on Friday, 8 October 2010 07:20:11 GMT

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