XmlSchema incorrectly allows text in schema file

If there is a simple (cdata) text in schema file,
QXmlSchema does not report an error

while for example:
http://www.w3.org/2001/03/webdata/xsv says:

Schema validating with XSV 3.1-1 of 2007/12/11 16:20:05

• Target: file:/usr/local/XSV/xsvlog/tmpjeHc8Juploaded
  (Real name: schema.xsd)
• docElt: {http://www.w3.org/2001/XMLSchema}

  schema

• Validation was strict, starting with type [Anonymous]
• The schema(s) used for schema-validation had
  no errors
• 1 schema-validity problem was found in the target

Problems with the schema-validity of the target

file:/usr/local/XSV/xsvlog/tmpjeHc8Juploaded:1:40: Invalid per cvc-complex-type.1.2.3: text not allowed: | some cdata text |

In attachment schema file that is invalid, but QXmlSchema says it is ok, and main.cpp with sample validation