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%META:TOPICPARENT{name="VirtTipsAndTricksGuide"}% ---+How can I write custom crawler using PL? The following code is an example of loading data via crawler with special function to generate link for downloading: <verbatim> create procedure EUROPEANA_STORE (in _host varchar, in _url varchar, in _root varchar, inout _content varchar, in _s_etag varchar, in _c_type varchar, in store_flag int := 1, in udata any := null, in lev int := 0) { declare url varchar; declare xt, xp any; declare old_mode int; xt := xtree_doc (_content, 2); xp := xpath_eval ('//table//tr/td/a[@href]/text()', xt, 0); commit work; old_mode := log_enable (3,1); foreach (any u in xp) do { u := cast (u as varchar); url := sprintf ('http://semanticweb.cs.vu.nl/europeana/api/export_graph?graph=%U&mimetype=default&format=turtle', u); dbg_printf ('%s', u); { declare continue handler for sqlstate '*' { dbg_printf ('ERROR: %s', __SQL_MESSAGE); }; SPARQL LOAD ?:url into GRAPH ?:u; } } log_enable (old_mode, 1); return WS.WS.LOCAL_STORE (_host, _url, _root, _content, _s_etag, _c_type, store_flag, 0); } </verbatim> ---+++Related * [[VirtTipsAndTricksGuide][Virtuoso Tips and Tricks Collection]] * [[http://docs.openlinksw.com/virtuoso/htmlconductorbar.html#contentcrawlerrdf][Set Up the Content Crawler to Gather RDF]]
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