[xsd-users] Problem with ostream output of anonymous types and substitution groups

[Ray Lischner]

There seems to be a problem with ostream output of anonymous polymorphic types, using substitution groups. This is illustrated by copying the tests/cxx/tree/polymorphism/ostream example and changing the schema to:

<xsd:schema targetNamespace="test" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="test" elementFormDefault="qualified">
  <xsd:element name="root" type="type"/>
  <xsd:complexType name="type">
    <xsd:sequence>
      <xsd:element ref="base" minOccurs="0" maxOccurs="unbounded"/>
    </xsd:sequence>
  </xsd:complexType>

  <xsd:element name="base" type="Base" abstract="true"/>
  <xsd:complexType name="Base" abstract="true"/>

  <xsd:element name="der1" substitutionGroup="base">
    <xsd:complexType>
      <xsd:complexContent>
        <xsd:extension base="Base"/>
      </xsd:complexContent>
    </xsd:complexType>
  </xsd:element>

  <xsd:element name="der2" type="Der2" substitutionGroup="base"/>
  <xsd:complexType name="Der2">
    <xsd:complexContent>
      <xsd:extension base="Base"/>
    </xsd:complexContent>
  </xsd:complexType>
</xsd:schema>

Change the test.xml file to:

<root xmlns="test" xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance xsi:schemaLocation="test test.xsd">
  <der1/>
  <der2/>
</root>

Add --root-element root to the xsd_options in the makefile.

When I run the driver, I get a type_info exception:

no type information available for type ''

Also, the name "base" is printed instead of "der1" or "der2".


Ray Lischner,
Distinguished Member of Technical Staff
133 National Business Pkwy, Ste 150     t. 443.539.3448
Annapolis Junction, MD 20701            c. 410.854.5170
rlischner at proteuseng.com                f. 443.539.3370