System.Xml.Schema.SchemaCollectionCompiler.CompileSubstitutionGroup C# (CSharp) Méthode

        private void CompileSubstitutionGroup(XmlSchemaSubstitutionGroupV1Compat substitutionGroup) {
            if (substitutionGroup.IsProcessing) {
                foreach (XmlSchemaElement element in substitutionGroup.Members) {
                    SendValidationEvent(Res.Sch_SubstitutionCircularRef, element);
                    return;
                }
            }
            XmlSchemaElement examplar = (XmlSchemaElement)this.schema.Elements[substitutionGroup.Examplar];
            if (substitutionGroup.Members.Contains(examplar)) {// already checked
                return;
            }
            substitutionGroup.IsProcessing = true; 
            if (examplar != null) {
                if (examplar.FinalResolved == XmlSchemaDerivationMethod.All) {
                    SendValidationEvent(Res.Sch_InvalidExamplar, examplar);
                }

                foreach (XmlSchemaElement element in substitutionGroup.Members) {

                    //Chain to other head's that are members of this head's substGroup
                    XmlSchemaSubstitutionGroupV1Compat g = (XmlSchemaSubstitutionGroupV1Compat)examplars[element.QualifiedName];
                    if (g != null) {
                        CompileSubstitutionGroup(g);
                        foreach (XmlSchemaElement element1 in g.Choice.Items) {
                            substitutionGroup.Choice.Items.Add(element1);
                        }
                    }
                    else {
                        substitutionGroup.Choice.Items.Add(element);
                    }
                }
                substitutionGroup.Choice.Items.Add(examplar);
                substitutionGroup.Members.Add(examplar); // Compiled mark
            }
            else {
                foreach (XmlSchemaElement element in substitutionGroup.Members) {
                    SendValidationEvent(Res.Sch_NoExamplar, element);
                    break;
                }
            }
           substitutionGroup.IsProcessing = false;              
        }