[DFDL-WG] Precedence of short and long form properties

Fri Mar 20 03:35:00 CDT 2009

Suman

Correct

Alan Powell

 MP 211, IBM UK Labs, Hursley,  Winchester, SO21 2JN, England
 Notes Id: Alan Powell/UK/IBM     email: alan_powell at uk.ibm.com
 Tel: +44 (0)1962 815073                  Fax: +44 (0)1962 816898

  From:       Suman Kalia/Toronto/IBM at IBMCA                                                                                  

  To:         Alan Powell/UK/IBM at IBMGB                                                                                       

  Cc:         dfdl-wg at ogf.org                                                                                                

  Date:       19/03/2009 19:18                                                                                               

  Subject:    Re: Precedence of short and long form properties                                                               

Thanks Alan -- In nutshell, long from annotations take precedence over
short form when they are defined on the same xsd construct..

i.e. if you lengthKind specified in short form and on dfdl:element  on XSD
element declaration  value specified in dfdl:element will take precedence..

Suman Kalia
IBM Toronto Lab
WMB Toolkit Architect and Development Lead
WebSphere Business Integration Application Connectivity Tools

http://www.ibm.com/developerworks/websphere/zones/businessintegration/wmb.html

Tel : 905-413-3923  T/L  969-3923
Fax : 905-413-4850 T/L  969-4850
Internet ID : kalia at ca.ibm.com

  From:       Alan Powell/UK/IBM at IBMGB                                                                                       

  To:         Suman Kalia/Toronto/IBM at IBMCA                                                                                  

  Cc:         dfdl-wg at ogf.org%                                                                                               

  Date:       03/19/2009 02:11 PM                                                                                            

  Subject:    Precedence of short and long form properties                                                                   

Suman

One the last work group call you raised a question about precedence of the
same property in short and long form that we were unable to answer.

The last paragraph of section 10.3 provides the answer

10.3  Annotation Positioning

As described in Section ‎5.2, DFDL annotations are positioned at specific
annotation points within a DFDL schema. The table below shows the valid
annotation points.

   Annotation Point    |                    Property Scope                    
 ----------------------+----------------------------------------------------- 
   Schema declaration  |                        Invalid                       
                       |                                                      
                       |  Only top level defining forms (e.g.,                
                       |  dfdl:defineFormat) can appear at top level of the   
                       |  schema. These definitions are globally available.   
                       |  Nothing is put into effect about the format of      
                       |  data by these top-level definitions.                
 ----------------------+----------------------------------------------------- 
   Element declaration |                      Valid local                     
 ----------------------+----------------------------------------------------- 
   Element reference   |                      Valid local                     
 ----------------------+----------------------------------------------------- 
   Complex type        |              Valid scoped over contents              
   definition          |                                                      
 ----------------------+----------------------------------------------------- 
   Simple type         |                      Valid local                     
   definition          |                                                      
 ----------------------+----------------------------------------------------- 
   Sequence            |                      Valid local                     
   declaration         |                                                      
 ----------------------+----------------------------------------------------- 
   Choice declaration  |                      Valid local                     
 ----------------------+----------------------------------------------------- 
   Group reference     |                      Valid local                     

An annotation on a complexType definition applies over the scope of the
contents and so is inherited by any contained constructs or construct
references. That is, the scope include not only the part of the schema
lexically enclosed by the complexType declaration which puts this scope
into effect, but these properties are also inherited by these specific
instances of any referenced types, referenced elements, or referenced
groups from within that scope. This is sometimes called scoping over the
full dynamic extent of the scope, not just the lexically appearing scope.

When multiple DFDL annotation properties occur at the same annotation point
then they are combined with the rule that later format annotations override
earlier ones, (later meaning textually later in the schema document) and
short-form annotations are interpreted as if they appeared in a long-form
annotation that is first before any other long-form annotations.

Alan Powell

 MP 211, IBM UK Labs, Hursley,  Winchester, SO21 2JN, England
 Notes Id: Alan Powell/UK/IBM     email: alan_powell at uk.ibm.com
 Tel: +44 (0)1962 815073                  Fax: +44 (0)1962 816898