------------------------------------------------------------------
Slightly modified DTD with special root bibliograph element added;
------------------------------------------------------------------

<!DOCTYPE bib [
<!ELEMENT bibliograph (book*, article*)>
<!ELEMENT book (title, author+, year, publisher, place?)>
<!ELEMENT article (title, author+, journal, year, volume, pages?)>
<!ELEMENT publisher (name, location+)>
<!ELEMENT location (cityname, street)>
<!ELEMENT author (lastname,firstname)>
<!-- begin all PCDATA -->
<!ELEMENT title ( #PCDATA)>
<!ELEMENT year ( #PCDATA)>
<!ELEMENT lastname ( #PCDATA)>
<!ELEMENT firstname ( #PCDATA)>
<!ELEMENT cityname ( #PCDATA)>
<!ELEMENT street ( #PCDATA)>
<!ELEMENT name ( #PCDATA)>
<!ELEMENT journal ( #PCDATA)>
<!ELEMENT volume ( #PCDATA)>
<!ELEMENT pages ( #PCDATA)>
<!ELEMENT cityname ( #PCDATA)>
]>
<bibliograph>
 <book>
  <title> All about XML </title>
  <author>
   <lastname> Schmoney </lastname>
   <firstname> Joe </firstname>
  </author>
  <author>
   <lastname> Smith </lastname>
   <firstname> James </firstname>
  </author>
  <year> 2003 </year>
  <publisher>
   <name> Bill's Publishers </name>
   <location>
    <cityname> Worcester </cityname>
    <street> 100 institute </street>
   </location>
  </publisher>
  <place> Gordon Library </place>

 </book>

 <book>
  <title> Preparing for SATs </title>
  <author>
   <lastname> Miller  </lastname>
   <firstname> Rita  </firstname>
  </author>
  <year> 2001 </year>
  <publisher>
   <name> Random House  </name>
   <location>
    <cityname> New York </cityname>
    <street> 50 New York Ave </street>
   </location>
  </publisher>
  <place> Borders </place>
 </book>

 <book>
  <title> XML is for Dummies </title>
  <author>
   <lastname> Martinez  </lastname>
   <firstname> Manny  </firstname>
  </author>
  <year> 1999 </year>
  <publisher>
   <name> Dummy Company  </name>
   <location>
    <cityname> Los Angeles </cityname>
    <street> 1179 Hollywood Blvd </street>
   </location>
  </publisher>
 </book>
 <book>
  <title> Java Programming </title>
  <author>
   <lastname> Garnett  </lastname>
   <firstname> Shawn  </firstname>
  </author>
  <author>
   <lastname> Pierce  </lastname>
   <firstname> Antoine  </firstname>
  </author>
  <author>
   <lastname> Stevens  </lastname>
   <firstname> Steve  </firstname>
  </author>
  <year> 2001 </year>
  <publisher>
   <name> Sun  </name>
   <location>
    <cityname> Burlington </cityname>
    <street> Route 3 </street>
   </location>
  </publisher>
  <place> The Amazon </place>
 </book>

 <book>
  <title> Ada Programming </title>
  <author>
   <lastname> Thomas  </lastname>
   <firstname> Tom  </firstname>
  </author>
  <year> 1976 </year>
  <publisher>
   <name> The Publishing Co  </name>
   <location>
    <cityname> New York </cityname>
    <street> 821 Park Ave </street>
   </location>
  </publisher>
  <place> Random Store </place>
 </book>

 <article>
  <title> New Advances in Ada Programming </title>
  <author>
   <lastname> Thomas  </lastname>
   <firstname> Tom  </firstname>
  </author>
  <year> 1976 </year>
  <journal> ACM  </journal>
  <volume> 17 </volume>
 <pages> 25 </pages>
 </article>
 <article>
  <title> XML: More than HTML </title>
  <author>
   <lastname> Smith </lastname>
   <firstname> James </firstname>
  </author>
  <year> 2002 </year>
  <journal> SIGMOD  </journal>
  <volume> 1st </volume>
 <pages> 6 </pages>
 </article>
 <article>
  <title> How to Protect your System </title>
  <author>
   <lastname> Mitnick </lastname>
   <firstname> Harvey </firstname>
  </author>
  <year> 1997 </year>
  <journal> Computer Security  </journal>
  <volume> 5 </volume>
 </article>
 <article>
  <title> Classes in Java </title>
  <author>
   <lastname> Pierce  </lastname>
   <firstname> Antoine  </firstname>
  </author>
  <author>
   <lastname> Stevens  </lastname>
   <firstname> Steve  </firstname>
  </author>
  <year> 2001 </year>
  <journal>Programming Languages Monthly  </journal>
  <volume> 53 </volume>
 </article>
 <article>
        <title> Microsoft Access- Better than Oracle? </title>
  <author>
   <lastname> Parker  </lastname>
   <firstname> Sam  </firstname>
  </author>
  <year> 1991 </year>
  <journal>VLDB  </journal>
  <volume> 34 </volume>
  <pages> 20 </pages>
 </article>
</bibliograph>








-------------------------------------
DTD  with no specific root bibliograph element;
-------------------------------------

<!DOCTYPE bib [
<!ELEMENT book (title, author+, year, publisher, place?)>
<!ELEMENT article (title, author+, journal, year, volume, pages?)>
<!ELEMENT publisher (name, location+)>
<!ELEMENT location (cityname, street)>
<!ELEMENT author (lastname,firstname)>
<!-- begin all PCDATA -->
<!ELEMENT title ( #PCDATA)>
<!ELEMENT year ( #PCDATA)>
<!ELEMENT lastname ( #PCDATA)>
<!ELEMENT firstname ( #PCDATA)>
<!ELEMENT cityname ( #PCDATA)>
<!ELEMENT street ( #PCDATA)>
<!ELEMENT name ( #PCDATA)>
<!ELEMENT journal ( #PCDATA)>
<!ELEMENT volume ( #PCDATA)>
<!ELEMENT pages ( #PCDATA)>
<!ELEMENT cityname ( #PCDATA)>
]>
 <book>
  <title> All about XML </title>
  <author>
   <lastname> Schmoney </lastname>
   <firstname> Joe </firstname>
  </author>
  <author>
   <lastname> Smith </lastname>
   <firstname> James </firstname>
  </author>
  <year> 2003 </year>
  <publisher>
   <name> Bill's Publishers </name>
   <location>
    <cityname> Worcester </cityname>
    <street> 100 institute </street>
   </location>
  </publisher>
  <place> Gordon Library </place>

 </book>

 <book>
  <title> Preparing for SATs </title>
  <author>
   <lastname> Miller  </lastname>
   <firstname> Rita  </firstname>
  </author>
  <year> 2001 </year>
  <publisher>
   <name> Random House  </name>
   <location>
    <cityname> New York </cityname>
    <street> 50 New York Ave </street>
   </location>
  </publisher>
  <place> Borders </place>
 </book>

 <book>
  <title> XML is for Dummies </title>
  <author>
   <lastname> Martinez  </lastname>
   <firstname> Manny  </firstname>
  </author>
  <year> 1999 </year>
  <publisher>
   <name> Dummy Company  </name>
   <location>
    <cityname> Los Angeles </cityname>
    <street> 1179 Hollywood Blvd </street>
   </location>
  </publisher>
 </book>
 <book>
  <title> Java Programming </title>
  <author>
   <lastname> Garnett  </lastname>
   <firstname> Shawn  </firstname>
  </author>
  <author>
   <lastname> Pierce  </lastname>
   <firstname> Antoine  </firstname>
  </author>
  <author>
   <lastname> Stevens  </lastname>
   <firstname> Steve  </firstname>
  </author>
  <year> 2001 </year>
  <publisher>
   <name> Sun  </name>
   <location>
    <cityname> Burlington </cityname>
    <street> Route 3 </street>
   </location>
  </publisher>
  <place> The Amazon </place>
 </book>

 <book>
  <title> Ada Programming </title>
  <author>
   <lastname> Thomas  </lastname>
   <firstname> Tom  </firstname>
  </author>
  <year> 1976 </year>
  <publisher>
   <name> The Publishing Co  </name>
   <location>
    <cityname> New York </cityname>
    <street> 821 Park Ave </street>
   </location>
  </publisher>
  <place> Random Store </place>
 </book>

 <article>
  <title> New Advances in Ada Programming </title>
  <author>
   <lastname> Thomas  </lastname>
   <firstname> Tom  </firstname>
  </author>
  <year> 1976 </year>
  <journal> ACM  </journal>
  <volume> 17 </volume>
 <pages> 25 </pages>
 </article>
 <article>
  <title> XML: More than HTML </title>
  <author>
   <lastname> Smith </lastname>
   <firstname> James </firstname>
  </author>
  <year> 2002 </year>
  <journal> SIGMOD  </journal>
  <volume> 1st </volume>
 <pages> 6 </pages>
 </article>
 <article>
  <title> How to Protect your System </title>
  <author>
   <lastname> Mitnick </lastname>
   <firstname> Harvey </firstname>
  </author>
  <year> 1997 </year>
  <journal> Computer Security  </journal>
  <volume> 5 </volume>
 </article>
 <article>
  <title> Classes in Java </title>
  <author>
   <lastname> Pierce  </lastname>
   <firstname> Antoine  </firstname>
  </author>
  <author>
   <lastname> Stevens  </lastname>
   <firstname> Steve  </firstname>
  </author>
  <year> 2001 </year>
  <journal>Programming Languages Monthly  </journal>
  <volume> 53 </volume>
 </article>
 <article>
        <title> Microsoft Access- Better than Oracle? </title>
  <author>
   <lastname> Parker  </lastname>
   <firstname> Sam  </firstname>
  </author>
  <year> 1991 </year>
  <journal>VLDB  </journal>
  <volume> 34 </volume>
  <pages> 20 </pages>
 </article>