xml entity feature..

THE XML SPECIFICATION PREDEFINES FIVE SPECIAL PIECES OF CODE FOR CHARACTERS THAT ARE NORMALLY RECOGNISED AS PART OF THE XML LANGUAGE ITSELF. THESE ARE CALLED �CHARACTER ENTITIES� AND THEY MUST BE USED IF YOU WANT TO INCLUDE THOSE CHARACTERS AS PART OF AN ELEMENT�S CONTENT.CHARACTER ENTITIES USE A SPECIAL SYNTAX TO REPRESENT THE CHARACTER IN A WAY THAT AVOIDS THE XML PARSER INTERPRETING THE CHARACTER AS CODE.

&LT; REPRESENTS THE �<� LEFT ANGLE BRACKET.
&GT; REPRESENTS THE �<� RIGHT ANGLE BRACKET.
&AMP; REPRESENTS THE �&� AMPERSAND CHARACTER.
&APOS; REPRESENTS THE �`� SINGLE QUOTE APOSTROPHE.
&QUOTE;REPRESENTS THE ��� DOUBLE QUOTATION MARK.

XML ALSO SUPPORTS CHARACTER REFERENCES THAT CREATE A CHARACTER USING ITS UNICODE CHARACTER CODE. THESE ARE WRITTEN IN THE XML DOCUMENT AS �&#NNN;� WHERE �NNN� IS THE REFERENCE NUMBER.THIS IS USEFUL TO ADD CHARACTERS THAT ARE NOT AVAILABLE ON YOU KEYBOARD.