Recursion in XSD Schemas

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I need to create a recursive XSD schema that validates a tree structure of an XML document.

Sample XML:

XML

<?xml version="1.0" encoding="UTF-8"?>
<MooNElements>
  <MooNElement>
    <MooNParameters>
      <MooNParameter/>
      <MooNParameter/>
    </MooNParameters>
    <MooNElement>
      <MooNParameters>
        <MooNParameter/>
        <MooNParameter/>
      </MooNParameters>
    </MooNElement>
    <MooNElement>
      <MooNParameters>
        <MooNParameter/>
        <MooNParameter/>
      </MooNParameters>
    </MooNElement>
  </MooNElement>
  <MooNElement>
    <MooNParameters>
      <MooNParameter/>
      <MooNParameter/>
      <MooNParameter/>
    </MooNParameters>
    <MooNElement>
      <MooNParameters>
        <MooNParameter/>
        <MooNParameter/>
      </MooNParameters>
    </MooNElement>
  </MooNElement>
  <MooNElement>
    <MooNParameters>
      <MooNParameter/>
      <MooNParameter/>
      <MooNParameter/>
    </MooNParameters>
  </MooNElement>
  <MooNElement>
    <MooNElement>
      <MooNParameters>
        <MooNParameter/>
        <MooNParameter/>
      </MooNParameters>
      <MooNElement>
        <MooNParameters>
          <MooNParameter/>
        </MooNParameters>
        <MooNElement>
          <MooNParameters>
            <MooNParameter/>
          </MooNParameters>
        </MooNElement>
      </MooNElement>
    </MooNElement>
  </MooNElement>
</MooNElements>

I had created the following XSD using VS 2010

XSD:

XML

<?xml version="1.0" encoding="utf-8"?>
<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="MooNElements">
    <xs:complexType>
      <xs:sequence>
        <xs:element maxOccurs="unbounded" name="MooNElement">
          <xs:complexType>
            <xs:sequence>
              <xs:element minOccurs="0" name="MooNParameters">
                <xs:complexType>
                  <xs:sequence>
                    <xs:element maxOccurs="unbounded" name="MooNParameter" />
                  </xs:sequence>
                </xs:complexType>
              </xs:element>
              <xs:element minOccurs="0" maxOccurs="unbounded" name="MooNElement">
                <xs:complexType>
                  <xs:sequence>
                    <xs:element name="MooNParameters">
                      <xs:complexType>
                        <xs:sequence>
                          <xs:element maxOccurs="unbounded" name="MooNParameter" />
                        </xs:sequence>
                      </xs:complexType>
                    </xs:element>
                    <xs:element minOccurs="0" name="MooNElement">
                      <xs:complexType>
                        <xs:sequence>
                          <xs:element name="MooNParameters">
                            <xs:complexType>
                              <xs:sequence>
                                <xs:element name="MooNParameter" />
                              </xs:sequence>
                            </xs:complexType>
                          </xs:element>
                          <xs:element name="MooNElement">
                            <xs:complexType>
                              <xs:sequence>
                                <xs:element name="MooNParameters">
                                  <xs:complexType>
                                    <xs:sequence>
                                      <xs:element name="MooNParameter" />
                                    </xs:sequence>
                                  </xs:complexType>
                                </xs:element>
                              </xs:sequence>
                            </xs:complexType>
                          </xs:element>
                        </xs:sequence>
                      </xs:complexType>
                    </xs:element>
                  </xs:sequence>
                </xs:complexType>
              </xs:element>
            </xs:sequence>
          </xs:complexType>
        </xs:element>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>

How to simplify this inorder to validate the recursive nodes?

Thanks,

Sudheendra

Posted 28-Oct-14 23:28pm

Manoor Hebbar

Updated 29-Oct-14 1:22am

v3

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Maciej Los · Answer 1 · 2014-10-29T00:11:00

Solution 1

I'd suggest to use xsd.exe[^], which is helpful when you want to create xsd from xml file.

For further information, please see:
How to: Use the XML Schema Definition Tool to Generate Classes and XML Schema Documents[^]
Auto generating Entity classes with xsd.exe for XML Serialization and De-Serialization[^]
From XML to XSD[^]

Posted 29-Oct-14 0:11am

Maciej Los

Updated 29-Oct-14 0:15am

v2

Comments

Manoor Hebbar 29-Oct-14 7:14am

I had generated the XSD (pasted below), but I would like to simply the XSD so that it can handle the requirement of recursive nodes

Maciej Los 29-Oct-14 9:59am

Do not post code in comment. Use "Improve question" widget instead.