Consider this sentence:
In our work, they are mainly textual elements within the content, which serve as the starting point [
of a data region] or distinctive features within a data region.
I left out "of a data region" as it is in the second part of conjunction, however in that part it has "within" preposition. Is yet my sentence grammatical and natural?
How about:
In our work, they are mainly textual elements within the content, which serve as the starting point of a data region or distinctive features within them.
is it "them" or "it"?