System.Xml.Schema.BaseProcessor.IsValidGroupRedefine C# (CSharp) Method

        private bool IsValidGroupRedefine(XmlSchemaObject existingObject, XmlSchemaObject item) {
            XmlSchemaGroup group = item as XmlSchemaGroup;
            if (existingObject == group.Redefined) { //group is the redefinition of existingObject
                XmlSchemaGroup existingGroup = existingObject as XmlSchemaGroup;
                if (existingGroup.CanonicalParticle == null) { //If the existing one is not already compiled, then replace.
                    return true;
                }
            }
            return false;
        }