Agreed with the extra restrictions #1 and #2 and the additional/changed words in answer to Q2.
Errata will be added.

Regards

Steve Hanson
Architect, IBM Data Format Description Language (DFDL)
Co-Chair, OGF DFDL Working Group
IBM SWG, Hursley, UK
smh@uk.ibm.com
tel:+44-1962-815848
----- Forwarded by Steve Hanson/UK/IBM on 14/08/2013 17:20 -----

From:        Steve Hanson/UK/IBM
To:        Tim Kimber/UK/IBM@IBMGB,
Cc:        dfdl-wg@ogf.org, dfdl-wg-bounces@ogf.org
Date:        14/08/2013 13:17
Subject:        Re: [DFDL-WG] Extra restrictions needed for dfdl:floating 'yes' ?

---

Q1:
This is already disallowed.

Q2:
I think the way to look at this is that a non-floating array element must have its occurrences appearing contiguously, so the floating element can't appear in-between. In other words, floating 'yes' only makes a statement about the floating element, not about any other elements in the sequence.
If we agree, then that needs clarifying in 14.4, and the statement I quoted needs modifying.

"An ordered sequence of n element children all with either n or n-1 of those children with dfdl:floating='yes' is equivalent to an unordered sequence with the same n element children with dfdl:floating='no'."

Regards

Steve Hanson
Architect, IBM Data Format Description Language (DFDL)
Co-Chair, OGF DFDL Working Group
IBM SWG, Hursley, UK
smh@uk.ibm.com
tel:+44-1962-815848



From:        Tim Kimber/UK/IBM@IBMGB
To:        dfdl-wg@ogf.org,
Date:        14/08/2013 12:45
Subject:        Re: [DFDL-WG] Extra restrictions needed for dfdl:floating 'yes' ?
Sent by:        dfdl-wg-bounces@ogf.org

---

Good question.Here are a couple more to consider, along the same lines:

Q1: Suppose that the group looks like this:

<xs:sequence dfdl:sequenceKind="ordered">
<xs:element name="floating1" dfdl:floating="yes" type="xs:string"/>
<xs:group ref="someGlobalModelGroup">
<xs:element name="floating2" dfdl:floating="yes" type="xs:string"/>
<xs:sequence>

This is effectively an unordered group ( all except one member has floating='yes') but it contains a sequence group. Do we need to prohibit this?

Q2: Suppose that the group looks like this:

<xs:sequence dfdl:sequenceKind="ordered">
<xs:element name="floating1" dfdl:floating="yes" type="xs:string"/>
<xs:element name="nonFloating" dfdl:floating="no" type="xs:string"
            minOccurs="5" maxOccurs="5"
            dfdl:occursCountKind="implicit"/>
<xs:element name="floating2" dfdl:floating="yes" type="xs:string"/>
<xs:sequence>

Here, the 5 occurrences of nonFloating could be scattered all over the group's content, with floating elements in between. Is that something that we want to allow? It seems inconsistent with the decision to re: occursCountKind and sequenceKind='unordered'.

regards,

Tim Kimber, DFDL Team,
Hursley, UK
Internet:  kimbert@uk.ibm.com
Tel. 01962-816742  
Internal tel. 37246742




From:        Steve Hanson/UK/IBM@IBMGB
To:        dfdl-wg@ogf.org,
Date:        14/08/2013 12:15
Subject:        [DFDL-WG] Extra restrictions needed for dfdl:floating 'yes' ?
Sent by:        dfdl-wg-bounces@ogf.org

---

Section 14.4 of the spec says:

"An ordered sequence of n element children with either n or n-1 of those children with dfdl:floating='yes' is equivalent to an unordered sequence with the same n element children with dfdl:floating='no'."

Does this mean that the extra restrictions we recently added for unordered sequences must also apply to floating elements?

If so these would manifest themselves as:

#1: It is a schema definition error if an element with dfdl:floating 'yes' is an optional element or an array element and its dfdl:occursCountKind property is not ‘parsed’.

#2: It is a schema definition error if two or more elements with dfdl:floating 'yes' in the same group have the same name and the same namespace.

Regards

Steve Hanson
Architect, IBM Data Format Description Language (DFDL)
Co-Chair, OGF DFDL Working Group
IBM SWG, Hursley, UK
smh@uk.ibm.com
tel:+44-1962-815848
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Unless stated otherwise above:
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Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU

Unless stated otherwise above:
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Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU

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