Hallo MichaelK,
although such an API is planned, you will likely be without one for quit a while. In the meantime you just could write your data to a file and use a ‘system(“inoxmld function=load …”)’ call in your application to have that functionality. Note that the flags that you suggested, have no meaning in the context of the mass load client - only scanning is done there, no parsing (and, as you will expect: on the server-side there is no way to skip parsing 
All the best,
Hermann
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