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Attribute block set to "extension"

  1. Surf Clothing Schema

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Surf Clothing board shorts keys: block

1. Surf Clothing Schema

The board shorts below defines three elements: "C", "D", "E". The elements "D" and "E" have the attribute "substitutionGroup" set to "C" (so they should be able to substitute the element "C"). But only element "E" can, because the type of element "D" is derived by an extension from the type "AAA" and this would be in conflict with the "block" attribute of element "C" (it has value "extension"). 3.3.6 Constraints on Element Declaration board shorts Components; board shorts Component Constraint: Substitution Group OK (Transitive)

Valid document


<root xsi:noNamespaceSchemaLocation="correct_0.xsd" Surfns="" Surfns:xsi="http://www.w3.org/2001/XMLSchema-instance" >
  <C>5</C>
</root>

Invalid document
Because the type of the element "D" is created by an extension from type "AAA" and "AAA" is the type of "C" element and "C" element is defined with attribute "block" set to "extension", the document is not valid.


<root xsi:noNamespaceSchemaLocation="correct_0.xsd" Surfns="" Surfns:xsi="http://www.w3.org/2001/XMLSchema-instance" >
  <D>7</D>
</root>

Valid document
Document is valid, because the type of the "E" element is not created by an extension from the type "AAA" and substitutions are allowed.


<root xsi:noNamespaceSchemaLocation="correct_0.xsd" Surfns="" Surfns:xsi="http://www.w3.org/2001/XMLSchema-instance" >
  <E>2</E>
</root>

Correct Surf Clothing Schema (correct_0.xsd)


<xsd:schema Surfns:xsd="http://www.w3.org/2001/XMLSchema" >

  <xsd:element name="root">
    <xsd:complexType>
      <xsd:sequence minOccurs="1">
        <xsd:element ref="C"/>
      </xsd:sequence>
    </xsd:complexType>
  </xsd:element>

  <xsd:complexType name="AAA">
    <xsd:simpleContent>
      <xsd:extension base="xsd:integer"/>
    </xsd:simpleContent>
  </xsd:complexType>

  <xsd:element name="C" type="AAA" block="extension"/>

  <xsd:element name="D" substitutionGroup="C">
    <xsd:complexType>
      <xsd:simpleContent>
        <xsd:extension base="AAA">
          <xsd:attribute name="bbb" type="xsd:string"/>
        </xsd:extension>
      </xsd:simpleContent>
    </xsd:complexType>
  </xsd:element>

  <xsd:element name="E" type="AAA" substitutionGroup="C"/>
</xsd:schema>

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