[xsd-users] RE: Substitution groups & different namespaces.

[Moss, David R (SELEX Comms) (UK Christchurch)]

Boris, 

Comments below.

Cheers,
Dave.

Dave Moss
SELEX Communications
Grange Road
Christchurch 
Dorset  BH23 4JE
United Kingdom
Tel: + 44 (0) 1202 404841
Email: david.r.moss at selex-comm.com


> 
> This example looks right. Your original example looked like this:
> 
> <?xml version="1.0" encoding="UTF-8" standalone="no" ?>
> <b:UserDatabase  xmlns:b="http://www.dave.com/Base"
>                  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>                  xsi:type="DerivedUserConfig_t"
>                  xsi:schemaLocation="http://www.dave.com/Base test-
> users.xsd">
> </b:UserDatabase>
> 
> Here you are specifying via xsi:type that the UserDatabase element is
> actually of type DerivedUserConfig_t instead of UserDatabase_t but the
> problem is that DerivedUserConfig_t and UserDatabase_t are not related
> via inheritance. I think what you meant to write is this:
> 
> <?xml version="1.0" encoding="UTF-8" standalone="no" ?>
> <b:UserDatabase  xmlns:b="http://www.dave.com/Base"
>                  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>                  xsi:schemaLocation="http://www.dave.com/Base test-
> users.xsd">
> 
> <b:TestUserConfig xsi:type="DerivedUserConfig_t" Number="54321">
>    <Name>bob</Name>
>    <Age>50</Age>
> </b:TestUserConfig>
> 
> </b:UserDatabase>
> 
 [Moss, David R] 

You're right - that is what I meant. Your example needs the line
xsi:noNamespaceSchemaLocation="derived-user-config.xsd" as well though?
Otherwise I get unknown type DerivedUserConfig errors. Even with that
line, I get unknown Age element errors...
 
> Which can be equivalently rewritten using substitution groups as:
> 
> <?xml version="1.0" encoding="UTF-8" standalone="no" ?>
> <b:UserDatabase  xmlns:b="http://www.dave.com/Base"
>                  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>                  xsi:schemaLocation="http://www.dave.com/Base test-
> users.xsd">
> 
> <DerivedUserConfig Number="54321">
>    <Name>bob</Name>
>    <Age>50</Age>
> </DerivedUserConfig>
> 
> </b:UserDatabase>

[Moss, David R] 
Again, with the line
xsi:noNamespaceSchemaLocation="derived-user-config.xsd" this works fine.

I have a query - see comments in this code and the attached instance
doc:

using namespace Base;
auto_ptr<class UserDatabase_t> db( UserDatabase( "test-users.xml" ) );

UserDatabase_t::TestUserConfig::const_iterator i( 
                                       db->TestUserConfig().begin() );
       
// This has expected output
//  Name: fred
//  Number: 6666666
cerr << *i << endl; 	

i++; 

// This has expected output
//  Name: bob
//  Number: 1234567
cerr << *i << endl;

const DerivedUserConfig_t* pd = 
                         dynamic_cast<const DerivedUserConfig_t*>(&*i);

// This has expected output
// 50
cerr << pd->Age();

// This has unexpected output
// 0x004eeac0    
// Expected (or similar):
//  Name: fred
//  Number: 6666666
//  Age: 50   
cerr << pd;

Any ideas? Obviously the data is accessible so it's not going to cause
any real problems.

> 
> Does this make sense?

[Moss, David R] 
Yes, thanks. Sorry for taking up so much of your time!

> 
> 
> -boris


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