<?xml version="1.0" encoding="utf-8"?>
<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified"
xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:simpleType name="answer">
<xs:restriction base="xs:token">
<xs:pattern value="(\d+,?)*" />
</xs:restriction>
</xs:simpleType>
<xs:element name="questions">
<xs:complexType>
<xs:sequence>
<xs:element name="question" minOccurs="1" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="text" minOccurs="1" maxOccurs="1"
type="xs:string" />
<xs:element name="answers" minOccurs="1" maxOccurs="1">
<xs:complexType>
<xs:sequence>
<xs:element name="answer" type="xs:string" minOccurs="2"
maxOccurs="unbounded" />
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="images" minOccurs="0" maxOccurs="1">
<xs:complexType>
<xs:sequence>
<xs:element name="img" type="xs:base64Binary"
maxOccurs="unbounded" />
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="answer" use="required" type="answer"/>
<xs:attribute name="type" use="optional" default="solo">
<xs:simpleType>
<xs:restriction base="xs:NMTOKEN">
<xs:enumeration value="multy" />
<xs:enumeration value="solo" />
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>

<?xml version="1.0" encoding="utf-8"?>
<questions>
<question type="solo" answer="3">
<text>Какая планета является третьей по счету от Солнца?</text>
<answers>
<answer>Нептун</answer>
<answer>Сатурн</answer>
<answer>Земля</answer>
<answer>Меркурий</answer>
</answers>
</question>
<question type="multy" answer="2,4">
<text>Выберите спутники Марса. (Выберите  2  ответа).</text>
<answers>
<answer>Квавар</answer>
<answer>Фобос</answer>
<answer>Иксион</answer>
<answer>Деймос</answer>
<answer>Орк</answer>
</answers>
<images>
<img>iVBORw0KGgoAAAANSUhEUgAAABkAAA...AAAASUVORK5CYII=</img>
</images>
</question>
</questions>