Hi, I have error message . Please help me.
17 Attribute value "001" of type ID must be an NCName when namespaces are enabled.
I am attaching file
<!DOCTYPE cataloge [
<!ELEMENT cataloge (DVD)* >
<!ELEMENT DVD (title?, genre?, rating?, viewerrating?, summary?, year?, director?, runtime?, studio?, actor? ) >
<!ELEMENT title (#PCDATA) >
<!ELEMENT genre (#PCDATA) >
<!ELEMENT rating (#PCDATA) >
<!ELEMENT viewerrating (#PCDATA) >
<!ELEMENT summary (#PCDATA) >
<!ELEMENT year (#PCDATA) >
<!ELEMENT directors (#PCDATA) >
<!ELEMENT runtime (#PCDATA) >
<!ELEMENT studio (#PCDATA) >
<!ELEMENT actor ( lastname, firstname)*>
<!ATTLIST actor id ID #REQUIRED >
<!ELEMENT firstname (#PCDATA) >
<!ELEMENT lastname (#PCDATA ) >
] >
<cataloge>
<DVD>
<title>Gone with the Wind</title>
<genre>Romance,Drama</genre>
<rating>G</rating>
<viewerrating>5.0</viewerrating>
<summary> Southern Belle who meets her match in Rhett Butler (Clark Gable) just as the Civil War breaks out. Living on a large cotton plantation called Tara in rural Georgia in 1861, Scarlett sees her beloved home and life as she knows it go up in flames -- but will her true love be lost too?</summary>
<year>1939</year>
<directors>Victor Fleming</directors>
<runtime>238 minits</runtime>
<studio>Selznick International</studio>
<actor id="001">
<lastname>Gable</lastname>
<firstname>Clark</firstname>
</actor>
<actor id="002">
<lastname>Leigh</lastname>
<firstname>Vivien</firstname>
</actor>
<actor id="003">
<lastname>Howard</lastname>
<firstname>Leslie</firstname>
</actor>
</DVD>
<DVD>
<title>The Dark Knight</title>
<genre>Action,Adventure</genre>
<rating>PG 13</rating>
<viewerrating>4.3</viewerrating>
<summary>the caped crusader (Christian Bale) teams with Lt. James Gordon (Gary Oldman) and District Attorney Harvey Dent (Aaron Eckhart) to continue dismantling Gotham City's criminal organizations. But a psychotic new villain known as the Joker (</summary>
<year>2008</year>
<directors>Christopher Nolan</directors>
<runtime>152 minits</runtime>
<studio>Legendary Pictures,Syncopy Films,DC Comics</studio>
<actor id="004">
<lastname>Bale</lastname>
<firstname>Christian</firstname>
</actor>
<actor id="005">
<lastname>Cain</lastname>
<firstname>Michael</firstname>
</actor>
<actor id="006">
<lastname>Ledger</lastname>
<firstname>Heath</firstname>
</actor>
</DVD>
<DVD>
<title>30 Minutes or Less</title>
<genre>Action,Comedy</genre>
<rating>R</rating>
<viewerrating>3.7</viewerrating>
<summary>Two small-town criminals planning a big-time bank heist wind up abducting pizza delivery driver Nick (Jesse Eisenberg) and forcing him to commit the robbery -- giving him a strict time limit to boot. To pull off the caper, Nick enlists the aid of a former buddy (Aziz Ansari). With the law, the crooks and the clock all breathing down their necks, the duo also try to patch up their troubled friendship in this frenetic action comedy.</summary>
<year>2011</year>
<directors>Ruben Fleischer</directors>
<runtime>83 minits</runtime>
<studio>Media Rights,Red Hour Films</studio>
<actor id="007">
<lastname>Eisenberg</lastname>
<firstname>Jesse</firstname>
</actor>
<actor id="008">
<lastname>McBride</lastname>
<firstname>Danny</firstname>
</actor>
<actor id="009">
<lastname>Ansari</lastname>
<firstname>Aziz</firstname>
</actor>
</DVD>
<DVD>
<title>Forrest Gump</title>
<genre>Romance, Drama</genre>
<rating>PG 13</rating>
<viewerrating>4.7</viewerrating>
<summary>simpleminded man who finds himself in the middle of nearly every major event of the 1960s and '70s. Along the way, he makes friends, changes lives and searches for a soul mate.</summary>
<year>1993</year>
<directors>Robert Zemeckis</directors>
<runtime>141 minits</runtime>
<studio>Paramount Pictures</studio>
<actor id="010">
<lastname>Hanks</lastname>
<firstname>Tom</firstname>
</actor>
<actor id="011">
<lastname>Sinise</lastname>
<firstname/>
</actor>
<actor id="012">
<lastname>Field</lastname>
<firstname>Sally</firstname>
</actor>
</DVD>
<DVD>
<title>Avatar</title>
<genre>Sci-Fi,Fiction</genre>
<rating>PG 13</rating>
<viewerrating>4.3</viewerrating>
<summary>Disabled Marine Jake Sully (Sam Worthington) travels to planet Pandora to become an avatar, ingratiate himself with the natives and help Americans mine lucrative unobtainium. But he finds himself in an interstellar conflict after falling for Na'vi warrior Neytiri (Zoe Saldana)</summary>
<year>2009</year>
<directors>James Cameron</directors>
<runtime>171 minits</runtime>
<studio>Lightstorm Entertainment</studio>
<actor id="013">
<lastname>Worthington</lastname>
<firstname>Sam</firstname>
</actor>
<actor id="014">
<lastname>Saldana</lastname>
<firstname>Zoe</firstname>
</actor>
<actor id="015">
<lastname>Lang</lastname>
<firstname>Stephen</firstname>
</actor>
</DVD>
</cataloge>
