System.Xml.Schema.XdrValidator.ValidateStartElement C# (CSharp) Method

        private void ValidateStartElement() {
            if (context.ElementDecl != null) {
                if (context.ElementDecl.SchemaType != null) {
                    reader.SchemaTypeObject =  context.ElementDecl.SchemaType;
                }
                else {
                    reader.SchemaTypeObject =  context.ElementDecl.Datatype;
                }
                if (reader.IsEmptyElement && !context.IsNill && context.ElementDecl.DefaultValueTyped != null) {
                   reader.TypedValueObject = context.ElementDecl.DefaultValueTyped;
                   context.IsNill = true; // reusing IsNill
                }
                if (this.context.ElementDecl.HasRequiredAttribute) {
                    attPresence.Clear();
                }   
            }

            if (reader.MoveToFirstAttribute()) {
                do {
                    if ((object)reader.NamespaceURI == (object)SchemaNames.NsXmlNs) {
                        continue;
                    }
                    
                    try {
                        reader.SchemaTypeObject = null;
                        SchemaAttDef attnDef = schemaInfo.GetAttributeXdr(context.ElementDecl, QualifiedName(reader.LocalName, reader.NamespaceURI));
                        if (attnDef != null) {
                            if (context.ElementDecl != null && context.ElementDecl.HasRequiredAttribute) {
                                attPresence.Add(attnDef.Name, attnDef);
                            }
                            reader.SchemaTypeObject = (attnDef.SchemaType != null) ? (object)attnDef.SchemaType : (object)attnDef.Datatype;
                            if (attnDef.Datatype != null) {
                                string attributeValue = reader.Value;
                                // need to check the contents of this attribute to make sure
                                // it is valid according to the specified attribute type.
                                CheckValue(attributeValue, attnDef);
                            }
                        }
                    }
                    catch (XmlSchemaException e) {
                        e.SetSource(reader.BaseURI, PositionInfo.LineNumber, PositionInfo.LinePosition);
                        SendValidationEvent(e);
                    }
                } while(reader.MoveToNextAttribute());
                reader.MoveToElement();
            }
        }