The answer is yes if you OBSERVE the following rules for using Xerces-C++ in a multi-threaded environment:

Within an address space, an instance of the parser may be used without restriction from a single thread, or an instance of the parser can be accessed from multiple THREADS, provided the application guarantees that only one thread has entered a method of the parser at any one time.

When two or more parser instances exist in a process, the instances can be used concurrently, without external synchronization. That is, in an application containing two parsers and two threads, one parser can be running within the first thread concurrently with the second parser running within the second thread.

The same rules apply to Xerces-C++ DOM documents. Multiple document instances may be concurrently accessed from different threads, but any GIVEN document instance can only be accessed by one thread at a time.

The application also needs to guarantee that the XMLPlatformUtils::Initialize() and XMLPlatformUtils::Terminate() METHODS are called from the same thread (usually the initial thread executing main()) or proper synchronization is performed by the application if multiple threads call XMLPlatformUtils::Initialize() and XMLPlatformUtils::Terminate() concurrently.

The answer is yes if you observe the following rules for using Xerces-C++ in a multi-threaded environment:

Within an address space, an instance of the parser may be used without restriction from a single thread, or an instance of the parser can be accessed from multiple threads, provided the application guarantees that only one thread has entered a method of the parser at any one time.

When two or more parser instances exist in a process, the instances can be used concurrently, without external synchronization. That is, in an application containing two parsers and two threads, one parser can be running within the first thread concurrently with the second parser running within the second thread.

The same rules apply to Xerces-C++ DOM documents. Multiple document instances may be concurrently accessed from different threads, but any given document instance can only be accessed by one thread at a time.

The application also needs to guarantee that the XMLPlatformUtils::Initialize() and XMLPlatformUtils::Terminate() methods are called from the same thread (usually the initial thread executing main()) or proper synchronization is performed by the application if multiple threads call XMLPlatformUtils::Initialize() and XMLPlatformUtils::Terminate() concurrently.