The Constructor can take a Pear::DB Data Source Name (DSN) and will then connect to the database; or a PEAR::DB object handle, if you already connected the database before. Providing sql-strings will not work.
If you provide only a DSN, you have to add a DB_result object, SQL statment or an array later.
The $root parameter is used, if you want to provide another name for your root-tag than <root>. If you give an empty string (""), there will be no root element created here, but only when you add a resultset, array or SQL Statment. And the first tag of this result is used as the root tag.
mixed $dsn - PEAR::DB "data source name" or DB_common object
string $root - the name of the XML-root element.
Example 48-1. Using XML_sql2xml()
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