sampledata.xml

<?xml version="1.0" encoding="UTF-8"?>
<bibliography xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:noNamespaceSchemaLocation="bib.xsd" >
  
  <publishers>
    
    <publisher id="springer">
      <name>Springer</name>
      <city>Berlin / Germany</city>
    </publisher>
    
    <publisher id="addWesley">
      <name>Addison-Wesley</name>
      <city>Reading, Massachusetts / USA</city>
    </publisher>
  </publishers>  
  
  <book id="ab94" publisher="springer" year="1994">
    <title>Infinite Dimensional Analysis</title>
    <author>Charalambos D. Aliprantis</author>
    <author>Kim C. Border</author>    
  </book>
  
  <book id="goossens93" publisher="addWesley" year="1993">
    <title>The LaTeX Companion</title>
    <author>Michel Goossens</author>
    <author>Frank Mittelbach</author>    
    <author>Alexander Samarin</author>    
  </book>
  
  <website id="bibtex" access="2018-07-15">
    <uri>https://en.wikipedia.org/wiki/BibTeX</uri>
    <title>BiBTeX - Wikipedia</title>
    <!-- Optional: <author>...</author> -->
  </website>
  
</bibliography>