xsd:complexType with children, attributes, and restrictions

Question

I'm working on creating a schema, but am getting stuck near my root element with defining it as a complexType that has children, attributes, and restrictions on those attributes

This is what I have tried so far.... (venetian blind format)

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<xsd:element name="foos">
    <xsd:complexType>
        <xsd:sequence>
            <xsd:element name="foo" type="FooType" minOccurs="1" maxOccurs="unbounded"/>
        </xsd:sequence>         
    </xsd:complexType>
</xsd:element>
<xsd:complexType name="FooType">
    <xsd:attribute name="exchangeType" type="xsd:string" use="required">
        <xsd:simpleType>
            <xsd:restriction base="xsd:string">
                <xsd:enumeration value="S" />
                <xsd:enumeration value="T" />
            </xsd:restriction>
        </xsd:simpleType>
    </xsd:attribute>
    <xsd:sequence>
        <xsd:element name="thing1" type="Thing1Type" />
        <xsd:element name="thing2" type="Thing2Type" />
    </xsd:sequence>
</xsd:complexType>
</xsd:schema>

I've been having trouble finding a way to incorporate this attribute and its restrictions

Any thoughts?

Answer 1

Two main corrections:

1. An xsd:attribute declaration cannot have both a local xsd:simpleType and a @type attribute; deleted the @type attribute.
2. An xsd:attribute declaration cannot appear before xsd:sequence; move it after.

XSD with corrections applied:

This XSD has the above corrections and a few other minor fixes applied and is now valid:

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <xsd:element name="foos">
    <xsd:complexType>
      <xsd:sequence>
        <xsd:element name="foo" type="FooType" 
                     minOccurs="1" maxOccurs="unbounded"/>
      </xsd:sequence>         
    </xsd:complexType>
  </xsd:element>
  <xsd:complexType name="FooType">
    <xsd:sequence>
      <xsd:element name="thing1" type="Thing1Type" />
      <xsd:element name="thing2" type="Thing2Type" />
    </xsd:sequence>
    <xsd:attribute name="exchangeType" use="required">
      <xsd:simpleType>
        <xsd:restriction base="xsd:string">
          <xsd:enumeration value="S" />
          <xsd:enumeration value="T" />
        </xsd:restriction>
      </xsd:simpleType>
    </xsd:attribute>
  </xsd:complexType>
  <xsd:complexType name="Thing1Type"/>
  <xsd:complexType name="Thing2Type"/>
</xsd:schema>