Hello,
I've begun experimenting with the PdfTextExtractor in iText as a
replacement for PDFBox. So far I'm very pleased with the results in
many cases, however I've noticed several examples where all the words
in the extracted text run together without spaces, so perhaps some
tweaking is needed in the character distance calculations. See this
PDF as an example where most spaces are missing:
http://nepomuk.semanticdesktop.org/xwiki/bin/download/Main1/Publications/Minack%202008.pdf
Sample output:
Abstract. WiththegrowthoftheSemanticWeb,therequirements
onstoringandqueryingRDFhasbecomemoresophisticated.When
alargeramountofdatahastobemanaged,queriesinstructuredquery
languages,suchasSPARQL,arenotalwayspowerfulenough.Useofad-
ditionalkeywordsforqueryingcanfurtherreducetheresultsettowards
theactualrelevantanswers,however,SPARQLonlyprovidescomplete
stringmatchingorlteringbasedonregularexpressions,whichisavery
slowoperation.Incontrast,stateoftheartInformationRetrieval(IR)
techniquesprovidesophisticatedfeaturessuchaskeywordsearch,lemma-
tisation,stemmingandranking.Inthispaperwepresentacombination
ofstructuredRDFqueriesandfull-textsearch.Itisimplementedasan
extensionofanestablishedRDFstore(Sesame)withIRcapabilitiesus-
ingthetextsearchlibraryLucene ,withoutrequiringmodicationsto
existingRDFquerylanguages.
Thanks for the great work, and hope this isn't too complicated to solve!
Cheers,
Alex
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