BO.ttl uses nif:firstSection, nif:lastSection incorrectly

[VladimirAlexiev]

https://raw.githubusercontent.com/NLP2RDF/DBpediaOpenDBpediaTextExtractionChallenge/master/BO.ttl
has several nif:firstSection and nif:lastSection. Shouldn't there be only one of each?

[chile12]

Every Section can have sub-sections (nif:hasSection). The first of which is again a nif:firstSection.

[VladimirAlexiev]

Ok, I see what you mean!
But then shouldn't the super-section wholly contain the sub-sections?
Below it seems that <char=19610,19633> is only the section title...

@base <http://en.dbpedia.org/resource/Barack_Obama?dbpv=2016-10&nif=section&>.
<char=19610,19633>
    nif:previousSection <char=18841,19608> ;
    nif:firstSection <char=19635,22243> ;
    nif:hasSection <char=19635,22243>, <char=22245,23756> ;

[chile12]

Sorry cant follow:

<char=19610,19633>
    a nif:Section ;
    <http://www.w3.org/2004/02/skos/core#notation> "3"^^<http://www.w3.org/2000/01/rdf-schema#Literal> .
    nif:firstSection <char=19635,22243> ;
    nif:hasSection <char=19635,22243>, <char=22245,23756> ;
    nif:previousSection <char=18841,19608> ;
    nif:referenceContext <http://en.dbpedia.org/resource/Barack_Obama?dbpv=2016-10&nif=context> ;
    nif:superString <http://en.dbpedia.org/resource/Barack_Obama?dbpv=2016-10&nif=context> ;

Which section is missing here?
This basically says:

1. I'm a Section
2. My Notation is 3
3. I have two sub-sections (note: nif:hasSection is transitive)
4. whereof char=19635,22243 is the first
5. and I have a super string and context

[VladimirAlexiev]

6. And my extent is 19610,19633 which is smaller than both of my subsections ?!?