XSL Warning in Eclipse

To make folling error

No grammar constraints (DTD or XML schema) detected for the document.

go away, add folling:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE xsl:stylesheet [<!ENTITY bullet "•"> <!ENTITY nbsp " ">]>

Change • to & #x2022;
and space to & #xa0; with no space between & and #