I need to validate this xml with xsd - xsd

Question

My xml file is
<?xml version="1.0" encoding="UTF-8"?>
<edge xmlns="http://www.example.org/stext">
<ellipse rx="189" ry="22" cx="279" cy="531"
style="fill:#FFFDFD;stroke:#000000;" id="Ellipse_23" isLocked="false" />
<ellipse rx="130" ry="38" cx="580" cy="393"
style="fill:#FFFDFD;stroke:#000000;" id="Ellipse_19" isLocked="false" />
<ellipse rx="172" ry="92" cx="539" cy="245"
style="fill:#BD7272;stroke:#D9B5B5;" id="Ellipse_20" isLocked="false" />
<circle r="51" cx="426" cy="284" style="fill:#BD7272;stroke:#D9B5B5;"
id="Circle_16" isLocked="false" />
<circle r="45" cx="428" cy="397" style="fill:#FFFDFD;stroke:#302E2E;"
id="Circle_17" isLocked="false" />
</edge>
This is my XSD schema
<?xml version="1.0" encoding="UTF-8"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.example.org/stext"
xmlns:tns="http://www.example.org/stext" elementFormDefault="qualified">
<element name="edge">
<complexType>
<sequence>
<element name="circle" maxOccurs="unbounded">
<complexType>
<attribute name="r" type="int" />
<attribute name="cx" type="int" />
<attribute name="cy" type="int" />
<attribute name="style" type="string" />
<attribute name="id" type="string" />
<attribute name="isLocked" type="boolean" />
</complexType>
</element>
<element name="ellipse" maxOccurs="unbounded">
<complexType>
<attribute name="rx" type="int" />
<attribute name="ry" type="int" />
<attribute name="cx" type="int" />
<attribute name="cy" type="int" />
<attribute name="style" type="string" />
<attribute name="id" type="string" />
<attribute name="isLocked" type="boolean" />
</complexType>
</element>
</sequence>
</complexType>
</element>
</schema>
I faced this kind of exception
Exception: cvc-complex-type.2.4.a: Invalid content was found starting with element 'ellipse'. One of '{"http://www.example.org/stext":circle}' is expected.

Answer 1

This happens, because <sequence> imposes a specific order.
I think what might solve your problem, is to use an additional xsd:choice element.
If you write it like
<sequence>
<choice maxOccurs="unbounded">
<element name="circle">
<complexType>
<attribute name="r" type="int" />
<attribute name="cx" type="int" />
<attribute name="cy" type="int" />
<attribute name="style" type="string" />
<attribute name="id" type="string" />
<attribute name="isLocked" type="boolean" />
</complexType>
</element>
<element name="ellipse">
<complexType>
<attribute name="rx" type="int" />
<attribute name="ry" type="int" />
<attribute name="cx" type="int" />
<attribute name="cy" type="int" />
<attribute name="style" type="string" />
<attribute name="id" type="string" />
<attribute name="isLocked" type="boolean" />
</complexType>
</element>
</choice>
</sequence>
that would allow for multiple circle OR ellipse elements in any order.