XMLSpaces.NET implements the Linda concept as a middleware for XML documents. It introduces an extended matching flexibility on nested tuples and richer data types for fields, including objects and XML documents. It is completely XML-based since data, tuples and tuplespaces are seen as trees represented as XML documents. XMLSpaces.NET is extensible in that it supports a hierarchy of matching relations on tuples and an open set of matching amongst data, documents and objects. It is currently being implemented on the .NET platform.