Problem with sql extensions

[Lucas Pérez]

Hello, I am new in this of XML and XSLT and have a problem with the extensions 
of SQL. I need to put one query of the type 

<xsl:param name="query" select="'SELECT * FROM ULS WHERE [ULS].[User-Name]
='0145516'"/>

and I not know how to put '0145516'. I obtain an exception of the type

XSLT Error (javax.xml.transform.TransformerConfigurationException): 
javax.xml.transform.TransformerException: 
javax.xml.transform.TransformerException: Extra illegal tokens: 'u0103516', 
'\', 
''''

I'm using a sun.jdbc.odbc.JdbcOdbcDriver with a MS Access database.

Thanks in advanced

        Lucas