Is It Impossible to have elements with same name in xsd? - xsd

Question

My XML looks like . I have two elements with same name. But I am not being able to get those elements in XSD.
Here Book is the element that appears twice but has different attributes. All attributes in their respective Book elements are required.
The error says
Element Books is not consistent with element Books
XML :
<TestRoot>
<Test Shelf="1">
<Value>
<Book Name="Wolves" />
</Value>
</Test>
<Test Shelf="2">
<Value>
<Book Name="Dogs" Pages="500" Photos="50" />
</Value>
</Test>
</TestRoot>
My XSD looks like :
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema....>
<xsd:element name="TestRoot">
<xsd:complexType>
<xsd:sequence minOccurs="1" maxOccurs="1">
<xsd:element name="Test" minOccurs="1" maxOccurs="unbounded">
<xsd:complexType>
<xsd:choice>
<xsd:element name="Value">
<xsd:complexType>
<xsd:choice minOccurs="1" maxOccurs="1">
<xsd:element name="Book">
<xsd:complexType>
<xsd:attribute name="Name" use="required">
<xsd:simpleType>
<xsd:restriction base="xsd:string">
<xsd:maxLength value="40"/>
<xsd:enumeration value="Wolves"/>
</xsd:restriction>
</xsd:simpleType>
</xsd:attribute>
</xsd:complexType>
</xsd:element>
<xsd:element name="Book">
<xsd:complexType>
<xsd:attribute name="Book" use="required">
<xsd:simpleType>
<xsd:restriction base="xsd:string">
<xsd:maxLength value="40"/>
<xsd:enumeration value="Dogs"/>
</xsd:restriction>
</xsd:simpleType>
</xsd:attribute>
<xsd:attribute name="Pages" use="required">
<xsd:simpleType>
<xsd:restriction base="xsd:string">
<xsd:maxLength value="50"/>
</xsd:restriction>
</xsd:simpleType>
</xsd:attribute>
<xsd:attribute name="Photos" use="required">
<xsd:simpleType>
<xsd:restriction base="xsd:string">
<xsd:maxLength value="24"/>
</xsd:restriction>
</xsd:simpleType>
</xsd:attribute>
</xsd:complexType>
</xsd:element>
</xsd:choice>
</xsd:complexType>
</xsd:element>
</xsd:choice>
<xsd:attribute name="Shelf" use="optional">
<xsd:simpleType>
<xsd:restriction base="xsd:string">
<xsd:maxLength value="100"/>
<xsd:enumeration value="1"/>
<xsd:enumeration value="2"/>
</xsd:restriction>
</xsd:simpleType>
</xsd:attribute>
</xsd:complexType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
</xsd:schema>
Not sure where I am wrong ? Any help?

Answer 1

Try something like this:
<?xml version="1.0" encoding="utf-8"?>
<xs:schema id="TestRoot" xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
<xs:element name="TestRoot" msdata:IsDataSet="true" msdata:Locale="en-US">
<xs:complexType>
<xs:choice minOccurs="0" maxOccurs="unbounded">
<xs:element name="Test">
<xs:complexType>
<xs:sequence>
<xs:element name="Value" minOccurs="0" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<!-- the <Book> node is just of "BookType" type -->
<xs:element name="Book" type="BookType" />
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="Shelf" type="xs:string" />
</xs:complexType>
</xs:element>
</xs:choice>
</xs:complexType>
</xs:element>
<!-- define the "BookType" which represents a single <Book> node -->
<xs:complexType name="BookType">
<xs:attribute name="Name" type="xs:string" use="required" />
<xs:attribute name="Pages" type="xs:string" />
<xs:attribute name="Photos" type="xs:string" />
</xs:complexType>
</xs:schema>
This XSD defines a new complex type BookType which is used to define how the <Book> nodes inside <Value> look like.
In general, I would also define a complex type for any of the XML nodes you have - I'd create a ValueType to handle how a <Value> node is made up, and I'd create a TestType for <Test> and a TestRootType for the <TestRoot> as well.
Having those really deeply nested XSD structures makes it really hard to "grasp" what's going on - defining a type for each node and then assigning them to the nodes makes it much more readable and understandable, in my opinion