[xsd-users] Need help with creating Object Model from scratch

[Boris Kolpackov]

Hi Laura,

Laura E Fowler <Laura_E_Fowler at raytheon.com> writes:

> I have been trying to figure out how to create an object model from 
> scratch with our specific schema. I can't find an example that is similar 
> to what we need to do. 

The easiest way is to start with the top level element. In your
case I believe it is Marker. This element is of anonymous type
so the name of its class will also be Marker. We start by 
creating an instance of Marker:

  Marker m (...);

Marker's constructor will have an argument for each required
element or attribute. In our case type Marker has four required
elements: id, deviceType, changed, and DeviceDescription. The
first three arguments are easy:

  Marker m ("marker-1", DeviceType::TYPEA, true, ...);

The last argument is of type DeviceDescription which itself
contains elements. So we first need to create an object of
this type:

  DeviceDescription dd;
  
  Marker m ("marker-1", DeviceType::TYPEA, true, dd);

But here our dd instance does not have any elements inside. So
we need to set one:

  DeviceDescriptionTypeB ddtb ("device-type-b");

  DeviceDescription dd;
  dd.DeviceDescriptionTypeB (ddtb);

  Marker m ("marker-1", DeviceType::TYPEA, true, dd);

The idea here is to start with the outer type and create and set
inner objects as required. Here is the complete example (assumes
the schema is saved as test.xsd):

#include <iostream>

#include "test.hxx"

using namespace std;
using namespace library;

int main ()
{
  DeviceDescriptionTypeB ddtb ("device-type-b");

  DeviceDescription dd;
  dd.DeviceDescriptionTypeB (ddtb);

  Marker m ("marker-1", DeviceType::TYPEA, true, dd);

  // Print.
  //
  cerr << m << endl;


  // Write to XML.
  //
  xml_schema::NamespaceInfomap map;

  map["lib"].name = "http://www.codesynthesis.com/library";
  map["lib"].schema = "test.xsd";

  Marker_ (std::cout, m, map);
}


Boris