SP doesn't support importing of PDFs or printed scores into its editable document model at this time. OTOH, if you have a MusicXML or MIDI version of these documents, SP will import them perfectly, and this is especially true of XML.
If you have only PDFs to work with, however, below are some known solutions for desktop that will generate XML files provided the former:
Audiveris (The only free & open source solution we're currently aware of
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