Mapping Atomic Types to CLR Types

This document explains the CLR types that are used to represent XDM values in XmlPrime.

These are the types that can be used for the arguments and return types of XDM functions implemented in C# classes. See Native modules for more information.

These are also the types that are used in the TypedValueTypedValueTypedValue and ValueTypeValueTypeValueType properties on the XPathAtomicValueXPathAtomicValueXPathAtomicValue class.

The types exposed for atomic values in XmlPrime differ from those used in the System.XmlSystem.XmlSystem.Xml namespace. In some places we have used different types because the types used in the System.XmlSystem.XmlSystem.Xml namespace do not fully represent the value (for example the lack of time zones in the date and time types).

In some cases more than one XDM type has the same corresponding CLR type (for example both xs:integer and xs:decimal are represented by decimalDecimaldecimal. When declaring a native function with a specified CLR type as an argument type or return type, the XDM type listed in bold will be used.

Unless otherwise annotated the use of the type byteBytebyte[] will be interpreted as a list of xs:byte values. In order to recieve or return xs:base64Binary or xs:hexBinary values the XdmTypeAttributeXdmTypeAttributeXdmTypeAttribute must be used.

Reference

• XPathAtomicValue ClassXPathAtomicValue ClassXPathAtomicValue Class

Other Resources

• Mapping XML Data Types to CLR Types