Element Requires Further Child Elements

So I was designing an XML file based on a certain DTD. The logic is thus:

    Category >> Books(can have many entries) >>Author[required], Price[required], Description, Image)

Here is the DTD generated:

 

  <!ELEMENT CATAGORY (PRODUCT+)>    <!ELEMENT PRODUCT    (NAME,PRICE,DESCRIPTION*,PICTURE*)>    <!ATTLIST PRODUCT    NAME CDATA #REQUIRED    PRICE CDATA #REQUIRED    DESCRIPTION CDATA #IMPLIED    PICTURE CDATA #IMPLIED    CATEGORY (BOOKS|GADGETS|OTHERS) "BOOKS"    AUTHOR CDATA #REQUIRED    ISBN CDATA #IMPLIED    INVENTORY (InStock|Backordered|Discontinued) "InStock">

However, I am unable to write a valid XML. I wrote thus:

 

  <CATAGORY>    	<PRODUCT NAME="XML BOOK" AUTHOR="XML GENIUS" CATEGORY="BOOKS" DESCRIPTION="BRILLIANT XML BOOK."  INVENTORY="InStock" ISBN="653725327" PRICE="36.99" PICTURE=""/>    	<PRODUCT NAME="XML MASTERS" AUTHOR="XML TEACHER" CATEGORY="BOOKS" DESCRIPTION="" INVENTORY="InStock" ISBN="" PICTURE="" PRICE="23.99"/>	    </CATAGORY>

I get the following error. Any help is appreciated. 

  C

ontent model of element <PRODUCT> requires further child elements.	Error location: CATAGORY / PRODUCT	Details		VC: Element Valid (2): Content model of element <PRODUCT> requires further child elements.