Thanks for the help, Mike.  I understand what you want me to do, but not why.  After all, the code I have works great on all the test data I’ve thrown at it.

Please explain how this is different from the schema code I have and why it is better.  TIA.

From: Mike Beckerle [mailto:mbeckerle.dfdl@gmail.com]
Sent: Friday, May 31, 2013 1:33 AM
To: Garriss Jr., James P.
Subject: Re: [DFDL-WG] [dfdl] initiatedContent w/o initiators

You need two nested choices. Only the inner one uses initiated content.

<xsd:choice>
    <xsd:choice dfdl:initiatedContent="yes">
           <xsd:element ref="Date"/>

           <xsd:element ref="From"/>

           <xsd:element ref="MessageId"/>

            <xsd:element ref="Subject"/>

    </xsd:choice>

    <!-- all unknown and unwanted headers -->

    <xsd:sequence dfdl:hiddenGroupRef="UnwantedHeadersGroup"/>

</xsd:choice>

On Thu, May 30, 2013 at 2:49 PM, Garriss Jr., James P. <jgarriss@mitre.org> wrote:

Spec says:

It is a schema definition error if any children have their dfdl:initiator property set to the empty string.

Does that include a sequence with a hiddenGroupRef?

For example, part of a schema for email headers is this:

                                                                        <xsd:choice dfdl:initiatedContent="yes">

                                                                                    <xsd:element ref="Date"/>

                                                                                    <xsd:element ref="From"/>

                                                                                    <xsd:element ref="MessageId"/>

                                                                                    <xsd:element ref="Subject"/>

                                                                                    <!-- all unknown and unwanted headers -->

                                                                                    <xsd:sequence dfdl:hiddenGroupRef="UnwantedHeadersGroup"/>

                                                                        </xsd:choice>

Date, From, and the other headers are all elements with initiators, but UnwantedHeadersGroup does not have an initiator (because I don’t know it a priori). 

Should this throw an error in a DFDL implementation?  I suspect it should, though I hope it shouldn’t.

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Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology | www.tresys.com