You can populate the SDM model using the
API, for example:
Object symbolNode = engine.getModel().createNode("symbol");
engine.getModel().addObject(symbolNode, null, null);
...
engine.getModel().setObjectProperty(symbolNode,
"longitude", new Double(Math.toRadians(44)));
engine.getModel().setObjectProperty(symbolNode,
"latitude", new Double(Math.toRadians(-105)));
...