System.Xml.Schema.DtdValidator.CheckDefaultValue C# (CSharp) Method

        public static void CheckDefaultValue(
            SchemaAttDef        attdef,
            SchemaInfo          sinfo,
            IDtdParserAdapter   readerAdapter
        ) {
            try {
                XmlSchemaDatatype dtype = attdef.Datatype;
                if (dtype == null) {
                    return; // no reason to check
                }
                object typedValue = attdef.DefaultValueTyped;

                // Check special types
                XmlTokenizedType ttype = dtype.TokenizedType;
                if (ttype == XmlTokenizedType.ENTITY) {
                    Uri baseUri = readerAdapter.BaseUri;
                    string baseUriStr = ( baseUri == null ) ? string.Empty : baseUri.ToString();
                    if (dtype.Variety == XmlSchemaDatatypeVariety.List) {
                        string[] ss = (string[])typedValue;
                        foreach(string s in ss) {
                            ProcessEntity(sinfo, s, readerAdapter, readerAdapter.EventHandler, baseUriStr, attdef.ValueLineNum, attdef.ValueLinePos);
                        }
                    }
                    else {
                        ProcessEntity(sinfo, (string)typedValue, readerAdapter, readerAdapter.EventHandler, baseUriStr, attdef.ValueLineNum, attdef.ValueLinePos);
                    }
                }
                else if (ttype == XmlTokenizedType.ENUMERATION) {
                    if (!attdef.CheckEnumeration(typedValue)) {
                        XmlSchemaException e = new XmlSchemaException(Res.Sch_EnumerationValue, typedValue.ToString(), readerAdapter.BaseUri.ToString(), attdef.ValueLineNum, attdef.ValueLinePos);
                        readerAdapter.SendValidationEvent( XmlSeverityType.Error, e );
                    }
                }
            }
#if DEBUG
            catch (XmlSchemaException ex) {
                Debug.WriteLineIf(DiagnosticsSwitches.XmlSchema.TraceError, ex.Message);
#else
            catch (Exception)  {
#endif
                XmlSchemaException e = new XmlSchemaException(Res.Sch_AttributeDefaultDataType, attdef.Name.ToString());
                readerAdapter.SendValidationEvent( XmlSeverityType.Error, e );
            }
        }
    };

 internal void CheckDefaultValue(SchemaInfo schemaInfo, IDtdParserAdapter readerAdapter)
 {
     DtdValidator.CheckDefaultValue(this, schemaInfo, readerAdapter);
     defaultValueChecked = true;
 }