[DFDL-WG] Extra restrictions needed for dfdl:floating 'yes' ?

[Tim Kimber]

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:sequence 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:
IBM United Kingdom Limited - Registered in England and Wales with number 
741598. 
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU
--
  dfdl-wg mailing list
  dfdl-wg at ogf.org
  https://www.ogf.org/mailman/listinfo/dfdl-wg

Unless stated otherwise above:
IBM United Kingdom Limited - Registered in England and Wales with number 
741598. 
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.ogf.org/pipermail/dfdl-wg/attachments/20130814/44914ccc/attachment-0001.html>