Queries related to extending from one XSD to another

Question

let's say I have below standard.xsd file piece of code,

<xs:complexType name="StdBasicTags">
        <xs:sequence>
            <xs:element name="Name" type="xs:string" nillable="true">
                <xs:annotation>
                    <xs:documentation>Name</xs:documentation>
                </xs:annotation>
            </xs:element>
        </xs:sequence>
    </xs:complexType>

Now I have another XSD file which inlcudes above file and adds some additional element to above complexType StdBasicTags

The file name is fullStandard.xsd and the way I have extended the StdBasicTags is as follows :

<xs:include schemaLocation="standard.xsd"/>
........
........
    <xs:complexType name="FullStdBasicTags">
            <xs:complexContent>
                <xs:extension base="StdBasicTags">
                    <xs:sequence>
                        <xs:element name="Surname" type="xs:string">
                            <xs:annotation>
                                <xs:documentation>Last name</xs:documentation>
                            </xs:annotation>
                        </xs:element>
                    </xs:sequence>
                </xs:extension>
            </xs:complexContent>
        </xs:complexType>

I have following queries,

1. I am using licensed Altova XmlSpy tool to generate Sample xml for fullStandard.xsd file but I can only see the Name element and not the Surname element as expected. Can anyone tell what is the possible reason to it, what is it that I am missing?

2. I am having to give another name which is FullStdBasicTags for extending the StdBasicTags and adding a new element. In this case what is going to be the output of the full final XML file? The idea is to have both Name and Surname under same parent complexType StdBasicTags.

3. Lastly, is there anything wrong with the architecture/output I am expecting?

Note** both the files are getting validated correctly. Also the idea is to achieve what I have just mentioned without making any changes to the standard.xsd file.

**UPDATE I am surprised that till now no one got any suggestions to me. Meanwhile I tried this,

   <xs:element name="FullNewRoot">
    <xs:complexType>
      <xs:sequence>
          <xs:element ref="rootElementName"/>
      </xs:sequence>
    </xs:complexType>
   </xs:element>

Where rootElementName is the root element of standard.xsd. After adding this now I am able to see the additional elements. But now the trouble is that, entire standard.xsd structure is appearing first and then whatever I have redefined in fullStandard.xsd is appearing, while I just want all of them for once.

Please please suggest something.

Answer 1

Please find answers for your questions below.

1. The possible reason is the type of the element. The type should be FullStdBasicTags if you're using StdBasicTags.

2. The parent type cannot refer to the new property added in the child type. The same principles of inheritance applies here.

Please find the samples below.

StdSchema.xsd

<?xml version="1.0" encoding="UTF-8"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.example.org/StdSchema"
    xmlns:tns="http://www.example.org/StdSchema" elementFormDefault="qualified">
    <complexType name="StdBasicTags">
        <sequence>
            <element name="Name" type="string" nillable="true">
                <annotation>
                    <documentation>Name</documentation>
                </annotation>
            </element>
        </sequence>
    </complexType>
</schema>

FullSchema.xsd

<?xml version="1.0" encoding="UTF-8"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.example.org/FullSchema"
    xmlns:tns="http://www.example.org/FullSchema" elementFormDefault="qualified"
    xmlns:tst="http://www.example.org/StdSchema">
    <include schemaLocation="StdSchema.xsd" />
    <import schemaLocation="StdSchema.xsd" namespace="http://www.example.org/StdSchema"></import>
    <complexType name="FullStdBasicTags">
        <complexContent>
            <extension base="tst:StdBasicTags">
                <sequence>
                    <element name="Surname" type="string">
                        <annotation>
                            <documentation>Last name</documentation>
                        </annotation>
                    </element>
                </sequence>
            </extension>
        </complexContent>
    </complexType>

    <element name="TestTag" type="tns:FullStdBasicTags"/>
</schema>

Sample XML:

<?xml version="1.0" encoding="UTF-8"?>
<tns:TestTag xmlns:tns="http://www.example.org/FullSchema" xmlns:tns1="http://www.example.org/StdSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.example.org/FullSchema FullSchema.xsd ">
  <tns1:Name>tns1:Name</tns1:Name>
  <tns:Surname>tns:Surname</tns:Surname>
</tns:TestTag>