tracker-extract,pdf: Port 'SLO ontology porting'
tracker-extract,pdf: Port 'SLO ontology porting'

Original commit ID: 2b0e002a41982f4373b06e882a08ca2123f515af

hoheinzollern/tracker,outofbits/tracker,outofbits/tracker,outofbits/tracker,outofbits/tracker,hoheinzollern/tracker,outofbits/tracker,outofbits/tracker,hoheinzollern/tracker,hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker,hoheinzollern/tracker,hoheinzollern/tracker