I am getting error after executing following code.any suggessions?
"Restriction DataSourceInfo is not specified"
import urllib
def main():
credentials = ('username', 'password')
URL = '''http://<Server name>:9320/aps/XMLA'''
xml=''
XML = """
<SOAP-ENV:Envelope
xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<SOAP-ENV:Body>
<Discover xmlns="urn:schemas-microsoft-com:xml-analysis"
SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<RequestType>MDSCHEMA_CUBES</RequestType>
<Restrictions>
<RestrictionList>
<CATALOG_NAME>RISKPL</CATALOG_NAME>
</RestrictionList>
</Restrictions>
<Properties>
<PropertyList>
<DataSourceInfo>
Provider=Essbase;Data Source=<Server name>
</DataSourceInfo>
<Format>Tabular</Format>
</PropertyList>
</Properties>
</Discover>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope> """
parameter = urllib.urlencode({'XML': XML})
response = urllib.urlopen(URL, parameter)
print response.read()