http://seowebmaster.cz/uvod-do-open-refine
Building from source https://github.com/OpenRefine/OpenRefine/wiki/Building-OpenRefine-From-Source
https://programminghistorian.org/en/lessons/fetch-and-parse-data-with-openrefine
Extensions list http://openrefine.org/download.html#list-of-extensions
RAM limit when loading CSV files https://stackoverflow.com/questions/47925325/google-openrefine-dont-load-big-csv-file
fetching URL https://github.com/OpenRefine/OpenRefine/wiki/Fetching-URLs-From-Web-Services
fetching & parsing data lesson https://programminghistorian.org/en/lessons/fetch-and-parse-data-with-openrefine
extract HTML attributes https://github.com/OpenRefine/OpenRefine/wiki/StrippingHTML
css selector syntax https://jsoup.org/cookbook/extracting-data/selector-syntax
value.parseHtml().select(".infobox")
value.parseHtml().select("div#content")[0].select("tr").toString()
forEach(value.parseHtml().select("a[href~=\\d+]"),e,e.htmlAttr("href")).join("SplitCharsGoHere")