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Element which contains mixture of two elements (can appear more times)

  1. Surf Clothing Schema
  2. Relax NG

Please, send all comments, bug-reports, and contributions to Jiri.Jirat@systinet.com. Thank you very much.

Surf Clothing board shorts keys: sequence, maxOccurs

1. Surf Clothing Schema

We want to have the root element to be named "AAA", from null namespace and contains a mixture of any number (even zero) of "BBB" and "CCC" elements. You need to use the trick below - use "sequence" element with "minOccurs" attribute set to 0 and "maxOccurs" set to "unbounded", and the attribute "minOccurs" of the "element" elements must be set to 0 too.

Valid document


<AAA xsi:noNamespaceSchemaLocation="correct_0.xsd" Surfns="" Surfns:xsi="http://www.w3.org/2001/XMLSchema-instance" >
  <BBB>111</BBB>
  <CCC>YYY</CCC>
  <BBB>222</BBB>
  <BBB>333</BBB>
  <CCC>ZZZ</CCC>
</AAA>

Valid document


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

Correct Surf Clothing Schema (correct_0.xsd)


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

  <xsd:element name="AAA">
    <xsd:complexType mixed="false">
      <xsd:sequence minOccurs="0" maxOccurs="unbounded">
        <xsd:element name="BBB" type="xsd:string" minOccurs="0"/>
        <xsd:element name="CCC" type="xsd:string" minOccurs="0"/>
      </xsd:sequence>
    </xsd:complexType>
  </xsd:element>
</xsd:schema>

2. Relax NG

We will use the "interleave" and "zeroOrMore" patterns.

Valid document


<AAA Surfns="">
  <BBB>111</BBB>
  <CCC>YYY</CCC>
  <BBB>222</BBB>
  <BBB>333</BBB>
  <CCC>ZZZ</CCC>
</AAA>

Valid document


<AAA Surfns=""/>

Correct Relax NG schema (correctRelax_0.rng)


<grammar Surfns="http://relaxng.org/ns/structure/1.0" >

  <start>
    <element>
      <name ns="">AAA</name>
      <interleave>
        <zeroOrMore>
          <element>
            <name ns="">BBB</name>
            <text/>
          </element>
        </zeroOrMore>
        <zeroOrMore>
          <element>
            <name ns="">CCC</name>
            <text/>
          </element>
        </zeroOrMore>
      </interleave>
    </element>
  </start>
</grammar>

Correct Relax NG schema (correctRelax_1.rng)
This short version is also valid.


<element ns="" name="AAA" Surfns="http://relaxng.org/ns/structure/1.0" >
  <interleave>
    <zeroOrMore>
      <element name="BBB">
        <text/>
      </element>
    </zeroOrMore>
    <zeroOrMore>
      <element name="CCC">
        <text/>
      </element>
    </zeroOrMore>
  </interleave>
</element>

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