Re: Field interpreted differentlybetweenphysicalandlogical

Barbara,

Thanks for staying with this.  The compile listing is what prompted my
original post.  I didn't understand why the definitions didn't match.

Let's see if I understand it now.  If I define an externally defined
data structure over an existing physical file the compiler will not
define the numeric subfields the same as the physical file because I
used a D-spec.   Instead, it will use default data types based on the
data types of the fields in the physical file.  That seems to eliminate
some of the benefit of using externally described data structures if the
subfields don't match the files defining them. 

Other than placing the underlying fields in the data structure, what is
the benefit of externally describing a data structure if the data types
may not match?

Rick


> -----Original Message-----
> From: wdsci-l-bounces@xxxxxxxxxxxx
> [mailto:wdsci-l-bounces@xxxxxxxxxxxx] On Behalf Of Barbara Morris
> Sent: Wednesday, March 08, 2006 12:40 PM
> To: wdsci-l@xxxxxxxxxxxx
> Subject: Re: [WDSCI-L] Field interpreted
> differentlybetweenphysicalandlogical
>
> Rick.Chevalier@xxxxxxxxxxxxxxx wrote:
> >
> > I guess it's the explicit part I'm having trouble with.  To
> me, I don't see where I have explicitly defined anything. 
> The qualified DS is defined based on the physical file and
> the logical files used in the program are externally
> described without any redefinition in the logical DDS. 
> Again, taking it's definition from the physical file.  If
> everything is being defined in terms of the physical file why
> are the defined differently in the program?  That's what is
> confusing me.
> >
>
> Rick, anything defined on D specs is explicitly defined;
> defining an externally-described data structure explicitly
> defines the data structure and its subfields.
>
> It might help to look in the compiler listing.  You can see
> the expansion of the externally-described data structure into
> multiple D specs.
>
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