[DFDL-WG] Extra restrictions needed for dfdl:floating 'yes' ?
Steve Hanson
smh at uk.ibm.com
Wed Aug 14 08:17:50 EDT 2013
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 at uk.ibm.com
tel:+44-1962-815848
From: Tim Kimber/UK/IBM at IBMGB
To: dfdl-wg at ogf.org,
Date: 14/08/2013 12:45
Subject: Re: [DFDL-WG] Extra restrictions needed for dfdl:floating
'yes' ?
Sent by: dfdl-wg-bounces at 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 at uk.ibm.com
Tel. 01962-816742
Internal tel. 37246742
From: Steve Hanson/UK/IBM at IBMGB
To: dfdl-wg at ogf.org,
Date: 14/08/2013 12:15
Subject: [DFDL-WG] Extra restrictions needed for dfdl:floating
'yes' ?
Sent by: dfdl-wg-bounces at 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:
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’.
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 at uk.ibm.com
tel:+44-1962-815848
Unless stated otherwise above:
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Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU
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741598.
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