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<HTML>
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<TITLE>WWW::Search::AltaVista - class for searching Alta Vista</TITLE>
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<TABLE BORDER=0 CELLPADDING=0 CELLSPACING=0 WIDTH=100%>
<TR><TD CLASS=block VALIGN=MIDDLE WIDTH=100% BGCOLOR="#cccccc">
<STRONG><P CLASS=block> WWW::Search::AltaVista - class for searching Alta Vista</P></STRONG>
</TD></TR>
</TABLE>
<A NAME="__index__"></A>
<!-- INDEX BEGIN -->
<UL>
<LI><A HREF="#name">NAME</A></LI><LI><A HREF="#supportedplatforms">SUPPORTED PLATFORMS</A></LI>
<LI><A HREF="#synopsis">SYNOPSIS</A></LI>
<LI><A HREF="#description">DESCRIPTION</A></LI>
<LI><A HREF="#options">OPTIONS</A></LI>
<LI><A HREF="#see also">SEE ALSO</A></LI>
<LI><A HREF="#how does it work">HOW DOES IT WORK?</A></LI>
<LI><A HREF="#author and current version">AUTHOR and CURRENT VERSION</A></LI>
<LI><A HREF="#copyright">COPYRIGHT</A></LI>
</UL>
<!-- INDEX END -->
<HR>
<P>
<H1><A NAME="name">NAME</A></H1>
<P>WWW::Search::AltaVista - class for searching Alta Vista</P>
<P>
<HR>
<H1><A NAME="supportedplatforms">SUPPORTED PLATFORMS</A></H1>
<UL>
<LI>Linux</LI>
<LI>Solaris</LI>
<LI>Windows</LI>
</UL>
<HR>
<H1><A NAME="synopsis">SYNOPSIS</A></H1>
<PRE>
require WWW::Search;
$search = new WWW::Search('AltaVista');</PRE>
<P>
<HR>
<H1><A NAME="description">DESCRIPTION</A></H1>
<P>This class is an AltaVista specialization of WWW::Search.
It handles making and interpreting AltaVista searches
<EM><A HREF="http://www.altavista.com">http://www.altavista.com</A></EM>.</P>
<P>This class exports no public interface; all interaction should
be done through WWW::Search objects.</P>
<P>
<HR>
<H1><A NAME="options">OPTIONS</A></H1>
<P>The default is for simple web queries.
Specialized back-ends for simple and advanced web and news searches
are available (see
<A HREF="../../../../site/lib/WWW/Search/AltaVista/Web.html">the WWW::Search::AltaVista::Web manpage</A>,
<A HREF="../../../../site/lib/WWW/Search/AltaVista/AdvancedWeb.html">the WWW::Search::AltaVista::AdvancedWeb manpage</A>,
<A HREF="../../../../site/lib/WWW/Search/AltaVista/News.html">the WWW::Search::AltaVista::News manpage</A>,
<A HREF="../../../../site/lib/WWW/Search/AltaVista/AdvancedNews.html">the WWW::Search::AltaVista::AdvancedNews manpage</A>).
These back-ends set different combinations following options.</P>
<DL>
<DT><STRONG><A NAME="item_search_url%3DURL">search_url=URL</A></STRONG><BR>
<DD>
Specifies who to query with the AltaVista protocol.
The default is at
<CODE>http://www.altavista.com/cgi-bin/query</CODE>;
you may wish to retarget it to
<CODE>http://www.altavista.telia.com/cgi-bin/query</CODE>
or other hosts if you think that they're ``closer''.
<P></P>
<DT><STRONG><A NAME="item_search_debug%2C_search_parse_debug%2C_search_ref_S">search_debug, search_parse_debug, search_ref
Specified at <A HREF="../../../../site/lib/WWW/Search.html">the WWW::Search manpage</A>.</A></STRONG><BR>
<DD>
<DT><STRONG><A NAME="item_pg%3Daq">pg=aq</A></STRONG><BR>
<DD>
Do advanced queries.
(It defaults to simple queries.)
<P></P>
<DT><STRONG><A NAME="item_what%3Dnews">what=news</A></STRONG><BR>
<DD>
Search Usenet instead of the web.
(It defaults to search the web.)
<P></P></DL>
<P>
<HR>
<H1><A NAME="see also">SEE ALSO</A></H1>
<P>To make new back-ends, see <A HREF="../../../../site/lib/WWW/Search.html">the WWW::Search manpage</A>,
or the specialized AltaVista searches described in options.</P>
<P>
<HR>
<H1><A NAME="how does it work">HOW DOES IT WORK?</A></H1>
<P><CODE>native_setup_search</CODE> is called before we do anything.
It initializes our private variables (which all begin with underscores)
and sets up a URL to the first results page in <CODE>{_next_url}</CODE>.</P>
<P><CODE>native_retrieve_some</CODE> is called (from <CODE>WWW::Search::retrieve_some</CODE>)
whenever more hits are needed. It calls the LWP library
to fetch the page specified by <CODE>{_next_url}</CODE>.
It parses this page, appending any search hits it finds to
<CODE>{cache}</CODE>. If it finds a ``next'' button in the text,
it sets <CODE>{_next_url}</CODE> to point to the page for the next
set of results, otherwise it sets it to undef to indicate we're done.</P>
<P>
<HR>
<H1><A NAME="author and current version">AUTHOR and CURRENT VERSION</A></H1>
<P><CODE>WWW::Search::AltaVista</CODE> is written and maintained
by John Heidemann, <<A HREF="mailto:johnh@isi.edu">johnh@isi.edu</A>>.</P>
<P>The best place to obtain <CODE>WWW::Search::AltaVista</CODE>
is from Martin Thurn's WWW::Search releases on CPAN.
Because AltaVista sometimes changes its format
in between his releases, sometimes more up-to-date versions
can be found at
<EM><A HREF="http://www.isi.edu/~johnh/SOFTWARE/WWW_SEARCH_ALTAVISTA/index.html">http://www.isi.edu/~johnh/SOFTWARE/WWW_SEARCH_ALTAVISTA/index.html</A></EM>.</P>
<P>
<HR>
<H1><A NAME="copyright">COPYRIGHT</A></H1>
<P>Copyright (c) 1996-1998 University of Southern California.
All rights reserved.
</P>
<PRE>
Redistribution and use in source and binary forms are permitted
provided that the above copyright notice and this paragraph are
duplicated in all such forms and that any documentation, advertising
materials, and other materials related to such distribution and use
acknowledge that the software was developed by the University of
Southern California, Information Sciences Institute. The name of the
University may not be used to endorse or promote products derived from
this software without specific prior written permission.</PRE>
<P>THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.</P>
<TABLE BORDER=0 CELLPADDING=0 CELLSPACING=0 WIDTH=100%>
<TR><TD CLASS=block VALIGN=MIDDLE WIDTH=100% BGCOLOR="#cccccc">
<STRONG><P CLASS=block> WWW::Search::AltaVista - class for searching Alta Vista</P></STRONG>
</TD></TR>
</TABLE>
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