Validate repeating optional elements XML-Schema - xsd

Question

I am try to create an xsd schema that validates the following xml:
<results>
<row>
<PersonID key="true">1</PersonID>
<FirstName>John</FirstName>
<Surname>Smith</Surname>
<LogonName>jsmith</LogonName>
</row>
<row>
<PersonID key="true">2</PersonID>
<FirstName>Steve</FirstName>
<Surname>Jones</Surname>
<LogonName>sjones</LogonName>
</row>
The results node and row node are mandatory, but the nodes inside each row are optional and may have other nodes that I have not listed. There could 1 row or many rows.
I have created the below but I am unable to validate correctly:
<xs:element name="results">
<xs:complexType>
<xs:sequence>
<xs:element name="row" maxOccurs="unbounded" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:element name="PersonID" minOccurs="0">
<xs:complexType>
<xs:simpleContent>
<xs:extension base="xs:byte">
<xs:attribute type="xs:string" name="key" use="optional"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>
<xs:choice minOccurs="0">
<xs:element type="xs:string" name="FirstName" minOccurs="0"/>
<xs:element type="xs:string" name="Surname" minOccurs="0"/>
<xs:element type="xs:string" name="LogonName" minOccurs="0"/>
<xs:element type="xs:string" name="GroupName" minOccurs="0"/>
</xs:choice>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
Thanks.

Answer 1

If PersonID, FirstName etc. can occurr at most once - and in that specific order - try this:
<xs:element name="results">
<xs:complexType>
<xs:sequence>
<xs:element name="row" maxOccurs="unbounded" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:element name="PersonID" minOccurs="0">
<xs:complexType>
<xs:simpleContent>
<xs:extension base="xs:byte">
<xs:attribute type="xs:string" name="key" use="optional"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>
<xs:element type="xs:string" name="FirstName" minOccurs="0"/>
<xs:element type="xs:string" name="Surname" minOccurs="0"/>
<xs:element type="xs:string" name="LogonName" minOccurs="0"/>
<xs:element type="xs:string" name="GroupName" minOccurs="0"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
(basically just drop the choice element). If PersonID, FirstName etc. can occurr at most once but in any order you can use all:
<xs:element name="results">
<xs:complexType>
<xs:sequence>
<xs:element name="row" maxOccurs="unbounded" minOccurs="0">
<xs:complexType>
<xs:all>
<xs:element name="PersonID" minOccurs="0">
<xs:complexType>
<xs:simpleContent>
<xs:extension base="xs:byte">
<xs:attribute type="xs:string" name="key" use="optional"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>
<xs:element type="xs:string" name="FirstName" minOccurs="0"/>
<xs:element type="xs:string" name="Surname" minOccurs="0"/>
<xs:element type="xs:string" name="LogonName" minOccurs="0"/>
<xs:element type="xs:string" name="GroupName" minOccurs="0"/>
</xs:all>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
If you don't know elements can occur within row you can use:
<xs:element name="results">
<xs:complexType>
<xs:sequence>
<xs:element name="row" maxOccurs="unbounded" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:any minOccurs="0" maxOccurs="unbounded" processContents="skip"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
that accepts any element within row.