MXQuery is a low-footprint implementation of XQuery 1.0, XQuery Update 1.0, XQuery Fulltext 1.0 and XQuery Scripting 1.0 as well as a subset of XQuery 1.1 (windowing, try/catch). It provides extensions to do data stream processing/CEP and SOAP/REST
XMLSP - XML Stream Parser is a small & simple XML parser for C++. It uses STL for lists and strings. This tiny XML parser source code is less than 20kb in size. It support custom entities and special characters. Now with optional DOM support.