Vol-1 has two redundant parts

[liyakun]

@S6savahd , @clange I checked in the new generated dataset dataset/ceur-ws.ttl, there is no redundant part, the result is as follows:

<http://ceur-ws.org/Vol-1/#event> a ns1:WorkshopEvent ;
    ns1:hasLocation <http://dbpedia.org/resource/Germany> ;
    ns1:hasPart <http://ceur-ws.org/Vol-1/#part-KRDB> ;
    ns1:isSubEventOf <http://ceur-ws.org/Vol-1/#conf> ;
    ns6:beginsAtDatetime "1994-09-20T00:00:00+00:00"^^xsd:dateTime ;
    ns6:endsAtDatetime "1994-09-22T00:00:00+00:00"^^xsd:dateTime .

<http://ceur-ws.org/Vol-1/#part-KRDB> a ns3:Workshop ;
    ns1:partOf <http://ceur-ws.org/series/KRDB> ;
    ns4:title "Reasoning about structured objects - knowledge representation meets databases 1994" ;
    ns3:shortTitle "KRDB" ;
    ns2:edition 1 .

<http://ceur-ws.org/series/KRDB> ns1:hasPart <http://ceur-ws.org/Vol-1/#part-KRDB>,
        <http://ceur-ws.org/Vol-10/#part-KRDB>,
        <http://ceur-ws.org/Vol-2/#part-KRDB>,
        <http://ceur-ws.org/Vol-21/#part-KRDB>,
        <http://ceur-ws.org/Vol-29/#part-KRDB>,
        <http://ceur-ws.org/Vol-4/#part-KRDB>,
        <http://ceur-ws.org/Vol-45/#part-KRDB>,
        <http://ceur-ws.org/Vol-54/#part-KRDB>,
        <http://ceur-ws.org/Vol-79/#part-KRDB>,
        <http://ceur-ws.org/Vol-8/#part-KRDB> .

[S6savahd]

let's check it together later

[S6savahd]

due to memory problem, the first round of processing data was on separate pages a local machine, it is correct in the current version of dataset.