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  1. Qt
  2. QTBUG-41596

CLONE - QXmlSchemaValidator::validate doesn't terminate with valid schema

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Details

    • Bug
    • Resolution: Duplicate
    • Not Evaluated
    • None
    • 4.7.0
    • XML: QtXmlPatterns
    • None
    • Ubuntu 10.10, (uname: Linux 2.6.35-22-generic #35-Ubuntu SMP Sat Oct 16 20:45:36 UTC 2010 x86_64 GNU/Linux)

    Description

      Using the following schema:

      <?xml version="1.0" encoding="UTF-8"?>
      
      <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">
      
      	<xs:simpleType name="nonEmptyElement">
      
      		<xs:restriction base="xs:string">
      
      			<xs:minLength value="1"/>
      
      		</xs:restriction>
      
      	</xs:simpleType>
      
      	<xs:simpleType name="Alphanumeric">
      
      		<xs:restriction base="nonEmptyElement">
      
      			<xs:pattern value="[a-z A-Z0-9]*"/>
      
      		</xs:restriction>
      
      	</xs:simpleType>
      
      	<xs:simpleType name="nameType">
      
      		<xs:restriction base="nonEmptyElement"/>
      
      	</xs:simpleType>
      
      	<xs:simpleType name="shortnameType">
      
      		<xs:restriction base="Alphanumeric">
      
      			<xs:maxLength value="4096"/>
      
      		</xs:restriction>
      
      	</xs:simpleType>
      
      	<xs:simpleType name="developerType">
      
      		<xs:restriction base="nonEmptyElement"/>
      
      	</xs:simpleType>
      
      	<xs:simpleType name="publisherType">
      
      		<xs:restriction base="nonEmptyElement"/>
      
      	</xs:simpleType>
      
      	<xs:simpleType name="versionType">
      
      		<xs:restriction base="nonEmptyElement"/>
      
      	</xs:simpleType>
      
      	<xs:simpleType name="genreType">
      
      		<xs:restriction base="nonEmptyElement"/>
      
      	</xs:simpleType>
      
      	<xs:simpleType name="licenseType">
      
      		<xs:restriction base="nonEmptyElement">
      
      			<xs:maxLength value="4096"/>
      
      		</xs:restriction>
      
      	</xs:simpleType>
      
      	<xs:simpleType name="installerType">
      
      		<xs:restriction base="nonEmptyElement">
      
      			<xs:maxLength value="4096"/>
      
      		</xs:restriction>
      
      	</xs:simpleType>
      
      	<xs:simpleType name="childType">
      
      		<xs:restriction base="nonEmptyElement">
      
      			<xs:maxLength value="4096"/>
      
      		</xs:restriction>
      
      	</xs:simpleType>
      
      	<xs:simpleType name="iconPathType">
      
      		<xs:restriction base="xs:string">
      
      			<xs:maxLength value="4096"/>
      
      			<xs:minLength value="4096"/>
      
      		</xs:restriction>
      
      	</xs:simpleType>
      
      	<xs:complexType name="iconType">
      
      		<xs:simpleContent>
      
      			<xs:extension base="iconPathType">
      
      				<xs:attribute name="height" type="xs:integer"/>
      
      				<xs:attribute name="width" type="xs:integer"/>		
      
      			</xs:extension>
      
      		</xs:simpleContent>
      
      	</xs:complexType>
      
      	<xs:complexType name="metaType">
      
      		<xs:all>
      
      			<xs:element name="name" type="nameType" nillable="false" minOccurs="1" maxOccurs="1"/>
      
      			<xs:element name="shortname" type="shortnameType" nillable="false" minOccurs="1" maxOccurs="1"/>
      
      			<xs:element name="developer" type="developerType" nillable="false" minOccurs="1" maxOccurs="1"/>
      
      			<xs:element name="publisher" type="publisherType" nillable="false" minOccurs="0" maxOccurs="1"/>
      
      			<xs:element name="version" type="versionType" nillable="false" minOccurs="1" maxOccurs="1"/>
      
      			<xs:element name="genre" type="genreType" nillable="false" minOccurs="0"/>
      
      			<xs:element name="summary" type="xs:string" nillable="false" minOccurs="0" maxOccurs="1"/>
      
      			<xs:element name="description" type="xs:string" nillable="false" minOccurs="0" maxOccurs="1"/>
      
      			<xs:element name="icon" type="iconType" nillable="false" minOccurs="0"/>
      
      			<xs:element name="license" type="licenseType" nillable="false" minOccurs="0" maxOccurs="1"/>
      
      			<xs:element name="installer" type="installerType" minOccurs="1" maxOccurs="1"/>
      
      			<xs:element name="child" type="childType" minOccurs="0"/>
      
      		</xs:all>
      
      	</xs:complexType>
      
      	<xs:element name="meta" type="metaType">
      

      In the xmlpatterns/schema example that comes with the Qt examples (by replacing one of the included - and note, working - schemas), the xmlpatternsvalidator program that comes with the qt4-dev-tools ubuntu package, and this little test program

      #include <QtXmlPatterns>
      
      #include <iostream>
      
      int main(int argc, char** argv)
      {
          QCoreApplication app(argc, argv);
      
          QFile schemaFile("metadata.xsd");
          schemaFile.open(QIODevice::ReadOnly);
      
          const QString schemaText(QString::fromUtf8(schemaFile.readAll()));
          
          QFile instanceFile("test.xml");
          instanceFile.open(QIODevice::ReadOnly);
          const QString instanceText(QString::fromUtf8(instanceFile.readAll()));
      
          const QByteArray schemaData = schemaText.toUtf8();
          const QByteArray instanceData = instanceText.toUtf8();
      
          std::cerr << "Hello" << std::endl;
      
          QXmlSchema schema;
          schema.load(schemaData);
      
          std::cerr << "World" << std::endl;
      
          bool errorOccurred = false;
          if (!schema.isValid()) {
              std::cerr << "Schema invalid." << std::endl;
          } else {
      	    std::cerr << "Schema is valid, proceeding" << std::endl;
              QXmlSchemaValidator validator(schema);
              std::cerr << "Created validator" << std::endl;
              if (!validator.validate(instanceData)) {
                  std::cerr << "Failed validation" << std::endl;
      	    } else {
                  std::cerr << "Validated." << std::endl;
              }
          }
      
          return app.exec();
      }
      

      It seems to encounter an infinite loop on the line

      if (!validator.validate(instanceData))
      

      If I make the schema invalid by (for example) setting the 'mixed' attribute
      on the complexType element that contains simpleContent (iconType), then the
      program properly runs saying "Schema Invalid".

      It happens with the following XML data, but I'm not sure how much that
      should make a difference:

      <?xml version="1.0" encoding="utf-8" ?>
      <meta>
          <shortname>foo</shortname>
          <installer>install/fooinstall.xml</installer>
          <name>Foo</name>
          <version>0.1</version>
          <license>licenses/license.txt</license>
          <developer>Quixote</developer>
          <description>ABC</description>
          <child>children/bar.xml</child>
      </meta>
      

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              Unassigned Unassigned
              lcoudeville Laurens Coudeville
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                Created:
                Updated:
                Resolved: