QXmlSchemaValidator segfaults after adding new complex element

Question

I am using QT 5.12 to validate and parse XML files.

I have the following complex type, which works fine:

  <xs:complexType name="startDefn">
    <xs:sequence>
      <xs:element ref="testsuite:obj"/>
      <xs:element minOccurs="0" ref="testsuite:starfile"/>
      <xs:element minOccurs="0" ref="testsuite:firfile"/>
      <xs:element minOccurs="0" ref="testsuite:funcfile"/>
    </xs:sequence>
  </xs:complexType>

However, I need to extend it by adding a new complex type. I'd like the final addition which needs to specify 2 files to look like this in the XML: (having is optional, but if it is present both the files should be specified)

  <start>
    <obj>src/models/test.obj</obj>
    <regulation>
        <start>testing/Test8/example.out.0</start>
        <end>testing/Test8/example.out.1</end>
    </regulation>
  </start>

So I tried modifying the schema like the following:

  <xs:complexType name="startDefn">
    <xs:sequence>
      <xs:element ref="testsuite:obj"/>
      <xs:element minOccurs="0" ref="testsuite:starfile"/>
      <xs:element minOccurs="0" ref="testsuite:firfile"/>
      <xs:element minOccurs="0" ref="testsuite:funcfile"/>
       <xs:complexType name="regulation" minOccurs="0">
        <xs:sequence>
         <xs:element minOccurs="1" ref="testsuite:start"/>
         <xs:element minOccurs="1" ref="testsuite:end"/>
        </xs:sequence>
       </xs:complexType>
    </xs:sequence>
  </xs:complexType>

But when I try to validate my file after adding this change to the schema, QXmlSchemaValidator::validate() segfaults. I cannot see into the QT code to see exactly where.

I have also tried:

• Removing the sequence, so just elements directly inside the complex element
• Removing the minOccurs from the complexType
• Wrapping the complexType in an element

I'm not very familiar with XML or schema, so any help is appreciated.

(I am not able to post the full schema here)

Answer 1

This may not be too helpful to others, but I was actually supposed to be modifying a .rnc file and using it to create a schema using Trang.

The changes it made were too complex to just put it here. Trying to modify the schema by hand was a mistake.