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

        private void CompileAttributeGroup(XmlSchemaAttributeGroup attributeGroup) {
            if (attributeGroup.IsProcessing) {
                SendValidationEvent(Res.Sch_AttributeGroupCircularRef, attributeGroup);
                return;
            }
            if (attributeGroup.AttributeUses.Count > 0) {// already checked
                return;
            }
            attributeGroup.IsProcessing = true;
            XmlSchemaAnyAttribute anyAttribute = attributeGroup.AnyAttribute;
            foreach (XmlSchemaObject obj in attributeGroup.Attributes) {
                if (obj is XmlSchemaAttribute) {
                    XmlSchemaAttribute attribute = (XmlSchemaAttribute)obj;
                    if (attribute.Use != XmlSchemaUse.Prohibited) {
                        CompileAttribute(attribute);
                    }
                    if (attributeGroup.AttributeUses[attribute.QualifiedName] == null) {
                        attributeGroup.AttributeUses.Add(attribute.QualifiedName, attribute);
                    }
                    else  {
                        SendValidationEvent(Res.Sch_DupAttributeUse, attribute.QualifiedName.ToString(), attribute);
                    }
                }
                else { // XmlSchemaAttributeGroupRef
                    XmlSchemaAttributeGroupRef attributeGroupRef = (XmlSchemaAttributeGroupRef)obj;
                    XmlSchemaAttributeGroup attributeGroupResolved;
                    if (attributeGroup.Redefined != null && attributeGroupRef.RefName == attributeGroup.Redefined.QualifiedName) {
                        attributeGroupResolved = (XmlSchemaAttributeGroup)attributeGroup.Redefined;
                    }
                    else {
                        attributeGroupResolved = (XmlSchemaAttributeGroup)this.schema.AttributeGroups[attributeGroupRef.RefName];
                    }
                    if (attributeGroupResolved != null) {
                        CompileAttributeGroup(attributeGroupResolved);
                        foreach (XmlSchemaAttribute attribute in attributeGroupResolved.AttributeUses.Values) {
                            if (attributeGroup.AttributeUses[attribute.QualifiedName] == null) {
                                attributeGroup.AttributeUses.Add(attribute.QualifiedName, attribute);
                            }
                            else {
                                SendValidationEvent(Res.Sch_DupAttributeUse, attribute.QualifiedName.ToString(), attribute);
                            }
                        }
                        anyAttribute = CompileAnyAttributeIntersection(anyAttribute, attributeGroupResolved.AttributeWildcard);
                    }
                    else {
                        SendValidationEvent(Res.Sch_UndefAttributeGroupRef, attributeGroupRef.RefName.ToString(), attributeGroupRef);
                    }
                }
            }          
            attributeGroup.AttributeWildcard = anyAttribute;
            attributeGroup.IsProcessing = false;

        }