Mapping XML Data Types to CLR Types (from msdn)

The following table describes the default mapping between the XML data types and the common language runtime (CLR) types

Note:
The xs and the xdt prefixes are mapped to the http://www.w3.org/2001/XMLSchema and the http://www.w3.org/2003/05/xpath-datatypes namespace URIs respectively.

XML Type	CLR Type
xs:anyURI	Uri
xs:base64Binary	Byte[]
xs:boolean	Boolean
xs:byte	SByte
xs:date	DateTime
xs:dateTime	DateTime
xs:decimal	Decimal
xs:double	Double
xs:duration	TimeSpan
xs:ENTITIES	String[]
xs:ENTITY	String
xs:float	Single
xs:gDay	DateTime
xs:gMonthDay	DateTime
xs:gYear	DateTime
xs:gYearMonth	DateTime
xs:hexBinary	Byte[]
xs:ID	String
xs:IDREF	String
xs:IDREFS	String[]
xs:int	Int32
xs:integer	Decimal
xs:language	String
xs:long	Int64
xs:gMmonth	DateTime
xs:Name	String
xs:NCName	String
xs:negativeInteger	Decimal
xs:NMTOKEN	String
xs:NMTOKENS	String[]
xs:nonNegativeInteger	Decimal
xs:nonPositiveInteger	Decimal
xs:normalizedString	String
xs:NOTATION	XmlQualifiedName
xs:positiveInteger	Decimal
xs:QName	XmlQualifiedName
xs:short	Int16
xs:string	String
xs:time	DateTime
xs:token	String
xs:unsignedByte	Byte
xs:unsignedInt	UInt32
xs:unsignedLong	UInt64
xs:unsignedShort	UInt16
xdt:dayTimeDuration	TimeSpan
xdt:yearMonthDuration	TimeSpan
xdt:untypedAtomic	String
xdt:anyAtomicType	Object
xs:anySimpleType	String
Document node	XPathNavigator
Element node	XPathNavigator
Attribute node	XPathNavigator
Namespace node	XPathNavigator
Text node	XPathNavigator
Comment node	XPathNavigator
Processing instruction node	XPathNavigator