DTD in XML file is not validating due to definition error

Hi my xml file is shown below, everytime i try to validate it i get this error:
error code:10728980207
error reason: The attribute {xmlns}sml on this element is not defined in the DTD/Schema
error line: 16

Does anyone have any idea how to get rid of this error and validate the file successfully, there is a problem with my

<sml:grid xmlns:sml=“http://www.w3.org/TR/WD-XS/sml”>

Im not sure how to define the xmlns in my dtd/schema, is this the correct line to use??

Any help would much appreciated.

THANKS.

The XML file with DTD Schema is shown below:

<?xml version="1.0" ?> <!DOCTYPE sml:grid [

]>

<?xml-stylesheet type="text/xsl" href="gridy.xsl"?>

<sml:grid xmlns:sml=“http://www.w3.org/TR/WD-XS/sml”>
<sml:row id=“1”>
<sml:largesquare squareno=“1”>
<sml:smallrow rowid=“1”>
<sml:smallsquare cellid=“1” answer=“3”>3</sml:smallsquare>
<sml:smallsquare cellid=“2” answer=“9”></sml:smallsquare>
<sml:smallsquare cellid=“3” answer=“8”></sml:smallsquare>
</sml:smallrow>
<sml:smallrow rowid=“2”>
<sml:smallsquare cellid=“4” answer=“2”></sml:smallsquare>
<sml:smallsquare cellid=“5” answer=“4”>4</sml:smallsquare>
<sml:smallsquare cellid=“6” answer=“5”></sml:smallsquare>
</sml:smallrow>
<sml:smallrow rowid=“3”>
<sml:smallsquare cellid=“7” answer=“6”></sml:smallsquare>
<sml:smallsquare cellid=“8” answer=“1”></sml:smallsquare>
<sml:smallsquare cellid=“9” answer=“7”></sml:smallsquare>
</sml:smallrow>
</sml:largesquare>
<sml:largesquare squareno=“2”>
<sml:smallrow rowid=“4”>
<sml:smallsquare cellid=“10” answer=“1”></sml:smallsquare>
<sml:smallsquare cellid=“11” answer=“6”>6</sml:smallsquare>
<sml:smallsquare cellid=“12” answer=“5”>5</sml:smallsquare>
</sml:smallrow>
<sml:smallrow rowid=“5”>
<sml:smallsquare cellid=“13” answer=“7”></sml:smallsquare>
<sml:smallsquare cellid=“14” answer=“8”></sml:smallsquare>
<sml:smallsquare cellid=“15” answer=“9”>9</sml:smallsquare>
</sml:smallrow>
<sml:smallrow rowid=“6”>
<sml:smallsquare cellid=“16” answer=“3”>3</sml:smallsquare>
<sml:smallsquare cellid=“17” answer=“2”></sml:smallsquare>
<sml:smallsquare cellid=“18” answer=“4”></sml:smallsquare>
</sml:smallrow>
</sml:largesquare>
<sml:largesquare squareno=“3”>
<sml:smallrow rowid=“7”>
<sml:smallsquare cellid=“19” answer=“7”>7</sml:smallsquare>
<sml:smallsquare cellid=“20” answer=“4”>4</sml:smallsquare>
<sml:smallsquare cellid=“21” answer=“2”>2</sml:smallsquare>
</sml:smallrow>
<sml:smallrow rowid=“8”>
<sml:smallsquare cellid=“22” answer=“3”>3</sml:smallsquare>
<sml:smallsquare cellid=“23” answer=“6”></sml:smallsquare>
<sml:smallsquare cellid=“24” answer=“1”>1</sml:smallsquare>
</sml:smallrow>
<sml:smallrow rowid=“9”>
<sml:smallsquare cellid=“25” answer=“8”>8</sml:smallsquare>
<sml:smallsquare cellid=“26” answer=“9”></sml:smallsquare>
<sml:smallsquare cellid=“27” answer=“5”>5</sml:smallsquare>
</sml:smallrow>
</sml:largesquare>
</sml:row>
<sml:row id=“2”>
<sml:largesquare squareno=“4”>
<sml:smallrow rowid=“10”>
<sml:smallsquare cellid=“28” answer=“7”></sml:smallsquare>
<sml:smallsquare cellid=“29” answer=“3”>3</sml:smallsquare>
<sml:smallsquare cellid=“30” answer=“9”></sml:smallsquare>
</sml:smallrow>
<sml:smallrow rowid=“11”>
<sml:smallsquare cellid=“31” answer=“5”>5</sml:smallsquare>
<sml:smallsquare cellid=“32” answer=“8”></sml:smallsquare>
<sml:smallsquare cellid=“33” answer=“4”>4</sml:smallsquare>
</sml:smallrow>
<sml:smallrow rowid=“12”>
<sml:smallsquare cellid=“34” answer=“1”>1</sml:smallsquare>
<sml:smallsquare cellid=“35” answer=“6”></sml:smallsquare>
<sml:smallsquare cellid=“36” answer=“2”></sml:smallsquare>
</sml:smallrow>
</sml:largesquare>
<sml:largesquare squareno=“5”>
<sml:smallrow rowid=“13”>
<sml:smallsquare cellid=“37” answer=“8”></sml:smallsquare>
<sml:smallsquare cellid=“38” answer=“5”></sml:smallsquare>
<sml:smallsquare cellid=“39” answer=“1”></sml:smallsquare>
</sml:smallrow>
<sml:smallrow rowid=“14”>
<sml:smallsquare cellid=“40” answer=“6”>6</sml:smallsquare>
<sml:smallsquare cellid=“41” answer=“7”>7</sml:smallsquare>
<sml:smallsquare cellid=“42” answer=“2”>2</sml:smallsquare>
</sml:smallrow>
<sml:smallrow rowid=“15”>
<sml:smallsquare cellid=“43” answer=“9”></sml:smallsquare>
<sml:smallsquare cellid=“44” answer=“4”></sml:smallsquare>
<sml:smallsquare cellid=“45” answer=“3”></sml:smallsquare>
</sml:smallrow>
</sml:largesquare>
<sml:largesquare squareno=“6”>
<sml:smallrow rowid=“16”>
<sml:smallsquare cellid=“46” answer=“6”></sml:smallsquare>
<sml:smallsquare cellid=“47” answer=“2”></sml:smallsquare>
<sml:smallsquare cellid=“48” answer=“4”>4</sml:smallsquare>
</sml:smallrow>
<sml:smallrow rowid=“17”>
<sml:smallsquare cellid=“49” answer=“9”>9</sml:smallsquare>
<sml:smallsquare cellid=“50” answer=“1”></sml:smallsquare>
<sml:smallsquare cellid=“51” answer=“3”>3</sml:smallsquare>
</sml:smallrow>
<sml:smallrow rowid=“18”>
<sml:smallsquare cellid=“52” answer=“5”></sml:smallsquare>
<sml:smallsquare cellid=“53” answer=“7”>7</sml:smallsquare>
<sml:smallsquare cellid=“54” answer=“8”></sml:smallsquare>
</sml:smallrow>
</sml:largesquare>
</sml:row>
<sml:row id=“3”>
<sml:largesquare squareno=“7”>
<sml:smallrow rowid=“19”>
<sml:smallsquare cellid=“55” answer=“8”>8</sml:smallsquare>
<sml:smallsquare cellid=“56” answer=“7”></sml:smallsquare>
<sml:smallsquare cellid=“57” answer=“1”>1</sml:smallsquare>
</sml:smallrow>
<sml:smallrow rowid=“20”>
<sml:smallsquare cellid=“58” answer=“4”>4</sml:smallsquare>
<sml:smallsquare cellid=“59” answer=“5”></sml:smallsquare>
<sml:smallsquare cellid=“60” answer=“6”>6</sml:smallsquare>
</sml:smallrow>
<sml:smallrow rowid=“21”>
<sml:smallsquare cellid=“61” answer=“9”>9</sml:smallsquare>
<sml:smallsquare cellid=“62” answer=“2”>2</sml:smallsquare>
<sml:smallsquare cellid=“63” answer=“3”>3</sml:smallsquare>
</sml:smallrow>
</sml:largesquare>
<sml:largesquare squareno=“8”>
<sml:smallrow rowid=“22”>
<sml:smallsquare cellid=“64” answer=“4”></sml:smallsquare>
<sml:smallsquare cellid=“65” answer=“3”></sml:smallsquare>
<sml:smallsquare cellid=“66” answer=“6”>6</sml:smallsquare>
</sml:smallrow>
<sml:smallrow rowid=“23”>
<sml:smallsquare cellid=“67” answer=“2”>2</sml:smallsquare>
<sml:smallsquare cellid=“68” answer=“9”></sml:smallsquare>
<sml:smallsquare cellid=“69” answer=“8”></sml:smallsquare>
</sml:smallrow>
<sml:smallrow rowid=“24”>
<sml:smallsquare cellid=“70” answer=“5”>5</sml:smallsquare>
<sml:smallsquare cellid=“71” answer=“1”>1</sml:smallsquare>
<sml:smallsquare cellid=“72” answer=“7”></sml:smallsquare>
</sml:smallrow>
</sml:largesquare>
<sml:largesquare squareno=“9”>
<sml:smallrow rowid=“25”>
<sml:smallsquare cellid=“73” answer=“2”></sml:smallsquare>
<sml:smallsquare cellid=“74” answer=“5”></sml:smallsquare>
<sml:smallsquare cellid=“75” answer=“9”></sml:smallsquare>
</sml:smallrow>
<sml:smallrow rowid=“26”>
<sml:smallsquare cellid=“76” answer=“1”></sml:smallsquare>
<sml:smallsquare cellid=“77” answer=“3”>3</sml:smallsquare>
<sml:smallsquare cellid=“78” answer=“7”></sml:smallsquare>
</sml:smallrow>
<sml:smallrow rowid=“27”>
<sml:smallsquare cellid=“79” answer=“4”></sml:smallsquare>
<sml:smallsquare cellid=“80” answer=“8”></sml:smallsquare>
<sml:smallsquare cellid=“81” answer=“6”>6</sml:smallsquare>
</sml:smallrow>
</sml:largesquare>
</sml:row>
</sml:grid>