how xsd can represent different xml file?

Question

if I have this XML data Main.xml

  
 
  11 
  1 
 
 &         


        

Answer 1

Seems like @Devendra D. Chavan already provided a solution for you. I just want to provide general rule Any global element defined in xsd can be a potential root element in the instance document

Answer 2

It looks to me as if you should make the content model for SigmodRecord be an xs:choice with the two alternatives being Authors or Issue.

You'll get much more reusability of the definitions in the schema if you use more global top-level element (and perhaps type) declarations. A deeply nested schema like this, with only one top-level element declaration, can only describe one input document format - there's no provision for elements such as Author or Affiliation appearing in different places in different messages.

Some people like to make use of the xsi:type attribute for this kind of scenario: two alternative types for the SigmodRecord element, selected in the instance by using <SigmodRecord xsi:type="authors"> or <SigmodRecord xsi:type="issue">.

Answer 3

The schema you are looking for looks something like this,

<?xml version="1.0" encoding="utf-16"?>
<xsd:schema attributeFormDefault="unqualified" elementFormDefault="qualified" version="1.0" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <xsd:element name="SigmodRecord">
    <xsd:complexType>
      <xsd:sequence>
        <xsd:element name="issue">
          <xsd:complexType>
            <xsd:sequence>
              <xsd:element name="volume" type="xsd:int" />
              <xsd:element name="number" type="xsd:int" />
              <xsd:element name="articles">
                <xsd:complexType>
                  <xsd:sequence>
                    <xsd:element maxOccurs="unbounded" name="article">
                      <xsd:complexType>
                        <xsd:sequence>
                          <xsd:element name="title" type="xsd:string" />
                          <xsd:element name="initPage" type="xsd:int" />
                          <xsd:element name="endPage" type="xsd:int" />
                          <xsd:element ref="authors"/>
                        </xsd:sequence>
                      </xsd:complexType>
                    </xsd:element>
                  </xsd:sequence>
                </xsd:complexType>
              </xsd:element>
            </xsd:sequence>
          </xsd:complexType>
        </xsd:element>
        <xsd:element ref="authors"/>
      </xsd:sequence>
    </xsd:complexType>
  </xsd:element>
  <xsd:element name="authors">
    <xsd:complexType>
      <xsd:sequence>
        <xsd:element maxOccurs="unbounded" name="author">
          <xsd:complexType>
            <xsd:attribute name="position" type="xsd:int" />
          </xsd:complexType>
        </xsd:element>
      </xsd:sequence>
    </xsd:complexType>
  </xsd:element>
</xsd:schema>

This schema will work for all the 3 xml fragments.