With XML, it is illegal to omit quotation marks around attribute values.
XML elements can have attributes in name/value pairs just like in HTML. In XML the attribute value must always be quoted. Study the two XML documents below. The first one is incorrect, the second is correct:
<?xml version="1.0" encoding="ISO-8859-1"?><note date=12/11/2002><to>Tove</to><from>Jani</from></note>
<?xml version="1.0" encoding="ISO-8859-1"?><note date="12/11/2002"><to>Tove</to><from>Jani</from></note>
The error in the first document is that the date attribute in the note element is not quoted.
This is correct: date="12/11/2002". This is incorrect: date=12/11/2002.