Xn source code

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In ROS files, such as XnCppWrapper.h, many functions return functions beginning with xn. For instance:

inline XnStatus AddNeededNode(ProductionNode& needed)
{
        return xnAddNeededNode(m_hNode, needed.m_hNode);
}

or

inline XnStatus RemoveNeededNode(ProductionNode& needed)
{
        return xnRemoveNeededNode(m_hNode, needed.m_hNode);
}

The ROS documentation sites, such as http://www.ros.org/doc/api/nao_openni/html/XnCppWrapper_8h_source.html do not provide code for the functions beginning with xn. The OpenNI section on git also has functions that call these xn functions. I am unable to find the definition of any of these functions on the OpenNI section however. Does anyone know where I can find the function definitions? Or are parts of OpenNI closed source?