Assertion: based search engine | /r/CapableOf | create their listings
Facets:
value: by using a piece of software
type: MANNER
value: automatically
type: MANNER
Source sentences:
text: Crawler-based search engines, such as Google, AllTheWeb and AltaVista, create their listings automatically by using a piece of software to crawl or spider the web and then index what it finds to build the search base.