Editing Web crawler (section)

=====Semantic focused crawler=====
Another type of focused crawlers is semantic focused crawler, which makes use of [[domain ontology|domain ontologies]] to represent topical maps and link Web pages with relevant ontological concepts for the selection and categorization purposes.<ref>{{cite book|chapter-url=https://www.researchgate.net/publication/44241179|doi=10.1007/978-3-642-02457-3_74|chapter=State of the Art in Semantic Focused Crawlers|title=Computational Science and Its Applications – ICCSA 2009|volume=5593|pages=910–924|series=Lecture Notes in Computer Science|year=2009|last1=Dong|first1=Hai|last2=Hussain|first2=Farookh Khadeer|last3=Chang|first3=Elizabeth|isbn=978-3-642-02456-6|hdl=20.500.11937/48288}}</ref> In addition, ontologies can be automatically updated in the crawling process. Dong et al.<ref>{{cite journal|url=https://www.researchgate.net/publication/264620349|doi=10.1002/cpe.2980|title=SOF: A semi-supervised ontology-learning-based focused crawler|journal=Concurrency and Computation: Practice and Experience|volume=25|issue=12|pages=1755–1770|year=2013|last1=Dong|first1=Hai|last2=Hussain|first2=Farookh Khadeer|s2cid=205690364}}</ref> introduced such an ontology-learning-based crawler using a [[support-vector machine]] to update the content of ontological concepts when crawling Web pages.