<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE content [
  <!ELEMENT img EMPTY>
  <!ATTLIST img src CDATA #REQUIRED width CDATA #REQUIRED height CDATA #REQUIRED alt CDATA #REQUIRED>
  <!ELEMENT p (#PCDATA | strong)*>
  <!ELEMENT record (img | p)+>
  <!ATTLIST record title CDATA #REQUIRED>
]>
<content>
  <record title="Welcome">
  <img src="hello.gif" width="100" height="50" alt="Hello" />
  <p><strong>Hello</strong></p>
  </record>
  </record>
</content>

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE content [

<!-- more tags  -->

  <!ELEMENT a (#PCDATA)>
  <!ATTLIST a href CDATA #REQUIRED onclick CDATA #IMPLIED rel CDATA #IMPLIED>
  <!ELEMENT acronym (#PCDATA)>
  <!ATTLIST acronym title CDATA #REQUIRED>
  <!ELEMENT address (#PCDATA | strong | br | a)*>
  <!ELEMENT br EMPTY>
  <!ATTLIST br class CDATA #IMPLIED>
  <!ELEMENT content (record+)>
  <!ELEMENT div (label | br | input | textarea)+>
  <!ELEMENT form (div)>
  <!ATTLIST form action CDATA #REQUIRED method CDATA #REQUIRED id CDATA #REQUIRED>
  <!ELEMENT img EMPTY>
  <!ATTLIST img src CDATA #REQUIRED width CDATA #REQUIRED height CDATA #REQUIRED alt CDATA #REQUIRED>
  <!ELEMENT input EMPTY>
  <!ATTLIST input type CDATA #REQUIRED id CDATA #IMPLIED name CDATA #IMPLIED size CDATA #IMPLIED value CDATA #IMPLIED class CDATA #IMPLIED>
  <!ELEMENT label (#PCDATA)>
  <!ELEMENT li (#PCDATA)>
  <!ELEMENT p (#PCDATA | a | strong | br | acronym)*>
  <!ATTLIST p class CDATA #IMPLIED>
  <!ELEMENT record (img | p | ul | address | form)+>
  <!ATTLIST record title CDATA #REQUIRED>
  <!ELEMENT strong (#PCDATA)>
  <!ELEMENT textarea EMPTY>
  <!ATTLIST textarea id CDATA #REQUIRED name CDATA #REQUIRED rows CDATA #REQUIRED cols CDATA #REQUIRED>
  <!ELEMENT ul (li+)>

<!-- table structure  -->

  <!ENTITY % content "p | h1 | h2 | h3 | h4 | h5 | h6 | ul | ol | table | center">
  <!ELEMENT table (tr+)>
  <!ATTLIST table height CDATA #IMPLIED width CDATA #IMPLIED align (left | center | right) #IMPLIED cellspacing CDATA #IMPLIED>
  <!ELEMENT tr (td+)>
  <!ATTLIST tr align (left | center | right) #IMPLIED valign (top | center | bottom | baseline) #IMPLIED>
  <!ELEMENT td (%content;)*>
  <!ATTLIST td height CDATA #IMPLIED width CDATA #IMPLIED align (left | center | right) #IMPLIED valign (top | center | bottom | baseline) #IMPLIED rowspan CDATA #IMPLIED colspan CDATA #IMPLIED>
]>