Hi Rahul,

Does the following schema work for you?

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
            xmlns="http://test.xsd"
            targetNamespace="http://test.xsd"
            elementFormDefault="qualified"
            attributeFormDefault="unqualified">

  <xsd:element name="X" type="X"/>
  <xsd:complexType name="X">
    <xsd:sequence>
      <xsd:element name="A" type="TypeA" minOccurs="0" maxOccurs="unbounded"/>
      <xsd:sequence minOccurs="0" maxOccurs="1">
        <xsd:element name="B" type="xsd:string" minOccurs="1" maxOccurs="1"/>
        <xsd:element name="A" type="TypeA" minOccurs="0" 
maxOccurs="unbounded"/>
      </xsd:sequence>
    </xsd:sequence>
  </xsd:complexType>
  <xsd:complexType name="TypeA">
  </xsd:complexType>
</xsd:schema>

Regards,
Shuhai

"Rahul" wrote:

> Hi,
> 
> I have to define a schema as below but this is not valid according to schema
> rules.
> 
> It violates the followign rule because I have element B as minOccurs = 0. It
> is fine if I make B as MinOccurs = 1.
> 
> http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/#cos-nonambig
> 
> How can I have define the schema in this situation so as to not violate the
> above rule.
> 
> 
> 
> <?xml version="1.0" encoding="UTF-8"?>
> 
> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
> xmlns="http://test.xsd" targetNamespace="http://test.xsd" 
> elementFormDefault="qualified" attributeFormDefault="unqualified">
> 
> <xsd:element name="X" type="X"/>
> 
> <xsd:complexType name="X">
> 
> <xsd:sequence>
> 
> <xsd:element name="A" type="TypeA" minOccurs="0" maxOccurs="unbounded"/>
> 
> <xsd:element name="B" type="xsd:string" minOccurs="0" maxOccurs="1"/>
> 
> <xsd:element name="A" type="TypeA" minOccurs="0" maxOccurs="unbounded"/>
> 
> </xsd:sequence>
> 
> </xsd:complexType>
> 
> <xsd:complexType name="TypeA">
> 
> </xsd:complexType>
> 
> </xsd:schema>
> 
> 
>