From the MSDN Help File:
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The basic syntax for specifying the XML mode in the FOR clause is:

FOR XML mode [, XMLDATA] [, ELEMENTS][, BINARY BASE64]

Arguments
XML mode

Specifies the XML mode. XML mode determines the shape of the resulting XML.
mode can be RAW, AUTO, or EXPLICIT.

XMLDATA

Specifies that an XML-Data schema should be returned. The schema is
prepended to the document as an inline schema.

ELEMENTS

If the ELEMENTS option is specified, the columns are returned as
subelements. Otherwise, they are mapped to XML attributes. This option is
supported in AUTO mode only.

BINARY BASE64

If the BINARY Base64 option is specified, any binary data returned by the
query is represented in base64-encoded format. To retrieve binary data using
RAW and EXPLICIT mode, this option must be specified. In AUTO mode, binary
data is returned as a reference by default.
