Xsd and inheritance

Question

I have an xsd like this

<xsd:complexType name="A">           <xsd:complexContent>               <xsd:sequence>                   <xsd:element name="options">                       <xsd:complexType>                           <xsd:sequence>                               <xsd:element name="Day">                               ...                               </xsd:element>                           </xsd:sequence>                       </xsd:complexType>                   </xsd:element>               </xsd:sequence>           </xsd:complexContent>   </xsd:complexType>    <xsd:complexType name="B">       <xsd:complexContent>         <xsd:extension base="A">         ...What would go here...         </xsd:extension>     </xsd:complexContent> </xsd:complexType>   

So basically I want class A to have a sequence of options (Day, Week for example) then I want B to inherit from A and have all of A's options and an additional 2 or 3 options like hours, seconds.

Answer 1

Here's the schema I came up with:

<?xml version="1.0" encoding="utf-8"?> <xs:schema id="inheritance"     targetNamespace="http://test.com"     elementFormDefault="qualified"     xmlns="http://www.w3.org/2001/XMLSchema"     xmlns:test="http://test.com" >     <xs:element name="Time">         <xs:complexType>             <xs:sequence>                 <xs:element name="First" type="test:A" />                 <xs:element name="Second" type="test:B" />             </xs:sequence>         </xs:complexType>     </xs:element>      <xs:complexType name="shortOptions">         <xs:sequence>             <xs:element name="Day" />         </xs:sequence>     </xs:complexType>      <xs:complexType name="longOptions">         <xs:complexContent>             <xs:extension base="test:shortOptions">                 <xs:sequence>                     <xs:element name="Week" />                 </xs:sequence>             </xs:extension>         </xs:complexContent>     </xs:complexType>      <xs:complexType name="A">         <xs:sequence>             <xs:element name="options" type="test:shortOptions" />         </xs:sequence>     </xs:complexType>      <xs:complexType name="B">         <xs:sequence>             <xs:element name="options" type="test:longOptions" />         </xs:sequence>     </xs:complexType>  </xs:schema> 

Which seems to fit this xml:

<?xml version="1.0" encoding="utf-8" ?> <Time xmlns="http://test.com">     <First>         <options>             <Day>Today</Day>         </options>     </First>     <Second>         <options>             <Day>Tomorrow</Day>             <Week>This Week</Week>         </options>     </Second> </Time> 

Answer 2

Simply add an <xsd:sequence> with the required elements:

<xsd:complexType name="B">       <xsd:complexContent>         <xsd:extension base="A">            <xsd:sequence>               <xsd:element name="Hours">               ...               </xsd:element>            </xsd:sequence>         </xsd:extension>     </xsd:complexContent> </xsd:complexType>