Elements with different names in a sequence

Question

How do I define schema for the following XML:

<root>
    <elements>
        <element1/>
        <element2/>
        <element1/>
    </elements>
    <elements>
        <element2/>
        <element1/>
    </elements>
    <elements>
        <element1/>
        <element2/>
    </elements>
</root>

where the number of elements element1 and element2 is unlimited and they can be intermixed in a varying order. Is it at all possible? Or should I just redefine XML as:

<root>
    <elements>
        <element type="1"/>
        <element type="2"/>
        <element type="1"/>
    </elements>
    <elements>
        <element type="2"/>
        <element type="1"/>
    </elements>
    <elements>
        <element type="1"/>
        <element type="2"/>
    </elements>
</root>

Just a side note, none of the codes you posted is a valid XML, the closing tags have to have /. — svick
– svick, Commented Jul 8, 2011 at 19:19

SaravananArumugam · Accepted Answer · 2011-07-08 19:31:26Z

Schema of your first structure

<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
    <xs:element name="root">
        <xs:complexType>
            <xs:sequence>
                <xs:element maxOccurs="unbounded" name="elements">
                    <xs:complexType>
                        <xs:sequence>
                            <xs:choice maxOccurs="unbounded">
                                <xs:element name="element1" />
                                <xs:element name="element2" />
                            </xs:choice>
                        </xs:sequence>
                    </xs:complexType>
                </xs:element>
            </xs:sequence>
        </xs:complexType>
    </xs:element>
</xs:schema>

Schema definition of your second structure

<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
    <xs:element name="root">
        <xs:complexType>
            <xs:sequence>
                <xs:element maxOccurs="unbounded" name="elements">
                    <xs:complexType>
                        <xs:sequence>
                            <xs:element maxOccurs="unbounded" name="element">
                                <xs:complexType>
                                    <xs:attribute name="type" type="xs:unsignedByte" use="required" />
                                </xs:complexType>
                            </xs:element>
                        </xs:sequence>
                    </xs:complexType>
                </xs:element>
            </xs:sequence>
        </xs:complexType>
    </xs:element>
</xs:schema>

svick · Accepted Answer · 2011-07-08 19:32:03Z

1

According to the Visual Studio schema generator, you can do it like this:

<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="root">
    <xs:complexType>
      <xs:sequence>
        <xs:element maxOccurs="unbounded" name="elements">
          <xs:complexType>
            <xs:sequence>
              <xs:choice maxOccurs="unbounded">
                <xs:element name="element1" />
                <xs:element name="element2" />
              </xs:choice>
            </xs:sequence>
          </xs:complexType>
        </xs:element>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>

answered Jul 8, 2011 at 19:32

svick

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