Help:CirrusSearch/it

CirrusSearch è il nuovo motore di ricerca per MediaWiki. Offre miglioramenti cruciali rispetto al vecchio LuceneSearch. Questa pagina descrive le caratteristiche che sono nuove o differenti in confronto alle soluzioni precedenti.

Domande frequenti
Se la tua domanda non trova risposta qui, per piacere chiedi in discussione e qualcuno ti risponderà.

Che cosa è migliorato?
Il nuovo motore di ricerca offre miglioramenti cruciali rispetto al vecchio, cioè:


 * ricerca migliorata in molteplici lingue,
 * aggiornamenti più rapidi degli indici, cioè le modifiche alle pagine sono incluse nei risultati di ricerca molto più velocemente,
 * espansione dei template, cioè tutto il contenuto di una pagina è contenuto nei risultati di ricerca, anche se proviene da template.

Aggiornamenti
Gli aggiornamenti dell'indice di ricerca sono effettuati quasi in tempo reale. Dovresti essere in grado di cercare le tue modifiche appena dopo averle fatte. Le modifiche alle template dovrebbero avere effetto sugli articoli che utilizzano la templare in pochi minuti. Le modifiche alle template usano la coda dei processi, quindi la performance può variare. Un cambiamento nullo all'articolo forzerà l'applicazione della modifica, ma non dovrebbe essere richiesto se tutto va bene.

Suggerimenti di ricerca
I suggerimenti di ricerca che ottieni quando scrivi nella casella di ricerca che ti mostra possibili pagine sono sostanzialmente gli stessi che gli articoli ordinati per numero di collegamenti in entrata. Val la pena di notare che se cominci la tua ricerca con ~ non troveremo articoli mentre scrivi e puoi cliccare invio in ogni momento per andare alla pagina dei risultati della ricerca.

La lettura dei caratteri ASCII/accentati/diacritici è in funzione per il testo inglese, ma ci sono dei problemi di formattazione con il risultato. Vedi 52656.

Ricerca nel testo
La ricerca nel testo (il tipo che ti porta alla pagina dei risultati della ricerca) cerca su titolo, rinvii, paragrafi e testo degli articoli quindi non dovrebbe presentare sorprese. Il grosso cambiamento qui è che le template sono ampliate.

Ci sono alcuni bug rilevanti aperti:


 * Le corrispondenze strette con le frasi (quelle che eliminano lo stemming) non sono sempre evidenziate in maniera soddisfacente

Filters (intitle:, incategory: and linksto:)


Abbiamo ristretto abbastanza la sintassi intorno a questi.


 * intitle:foo
 * Find articles whose title contains foo. Stemming is enabled for foo.
 * intitle:"foo bar"
 * Find articles whose title contains foo and bar. Stemming is enabled for foo and bar.
 * intitle:foo bar
 * Find articles whose title contains foo and whose title or text contains bar.
 * -intitle:foo bar
 * Find articles whose title does not contain foo and whose title or text contains bar.
 * intitle: foo bar
 * Syntax error, devolves into searching for articles whose title or text contains intitle:, foo, and bar.
 * incategory:Music
 * Find articles that are in Category:Music
 * incategory:"music history"
 * Find articles that are in Category:Music_history
 * incategory:"musicals" incategory:"1920"
 * Find articles that are in both Category:Musicals and Category:1920
 * -incategory:"musicals" incategory:"1920"
 * Find articles that are not in Category:Musicals but are in Category:1920
 * cow*
 * Find articles whose title or text contains words that start with cow
 * linksto:Help:CirrusSearch
 * find articles that link to a page
 * -linksto:Help:CirrusSearch CirrusSearch
 * find articles that mention CirrusSearch but do not link to the page Help:CirrusSearch

prefix:
The prefix: syntax in its current form is relied upon for a bunch of functionality so it's been recreated as exactly as possible.


 * prefix:cow
 * Find articles in the content namespaces whose title starts with the word "cow".
 * domestic prefix:cow
 * Find articles in the content namespaces whose title starts with the word "cow" and that contain the word "domestic".
 * domestic prefix:Cow/
 * Find all sub-pages of the article "Cow" in the content namespaces that contain the word "domestic". This is a very common search and is frequently built using a special URL parameter called.
 * domestic prefix:Talk:Cow/
 * Find all sub-pages of the talk page "Talk:Cow" in the talk namespace that contain the word "domestic".
 * cow prefix:Pink Floyd/
 * Find all sub-pages of the article "Pink Floyd" in the content namespaces that contain the word "cow". The space is now insignificant.

Note that the old rule of having to put prefix: at the end of the query still applies.

Special prefixes

 * morelike:Endothermic
 * Find articles whose text is similar to Endothermic.
 * Talk:Foo
 * Find articles in the talk namespace whose title or text contains the word foo

Did you mean
"Did you mean" suggestions are designed to notice if you misspell an uncommon phrase that happens to be an article title. If so, they'll let you know. They also seem to suggest more things than they ought to sometimes.

Prefer phrase matches
If you don't have too much special syntax in your query we'll give perfect phrase matches a boost. I'm being intentionally vague because I'm not sure exactly what "too much special syntax" should be. Right now if you add any explicit phrases to your search we'll turn off this feature.

Fuzzy search
Putting a ~ after a search term (but not double quotes) activates fuzzy search. You can also put a number from 0 to 1 to control the "fuzziness" fraction, e.g. nigtmare~.9 or lighnin~.1 or lighnin~0.1. Closer to one is less fuzzy.

Phrase search and proximity
Surrounding some words with quotes declares that you are searching for those words close together. You can add a ~ and then a number after the second quote to control just how close you mean. The proper name for this "closeness" is "phrase slop". The default "phrase slop" is 1.

Quotes and exact matches
Quotes turn on exact term matches. You can add a ~ to the quote to go back to the more aggressive matcher you know and love.

prefer-recent:
You can give recently edited articles a boost in the search results by adding "prefer-recent:" to the beginning of your search. By default this will scale 60% of the score exponentially with the time since the last edit, with a half life of 160 days. This can be modified like this: "prefer-recent:,". proportion_of_score_to_scale must be a number between 0 and 1 inclusive. half_life_in_days must be greater than 0 but allows decimal points. This number works pretty well if very small. I've tested it around .0001, which is 8.64 seconds.

This will eventually be on by default for Wikinews, but there is no reason why you can't activate it in any of your searches.

hastemplate:
You can filter pages to just those that use a template by adding  to the search. We try to emulate the template inclusion syntax so  finds pages with   and   would find transclusions of the article   from the main namespace. You can omit the quotes if the template's title you are looking for does not contain a space. will filter pages that contain that template.

You can combine all sorts of fun search syntax to get only middle quality images of china.

boost-templates:
You can boost pages scores based on what templates they contain. This can be done directly in the search via  or you can set the default for all searches via the new   message. replaces the contents of  if the former is specified. The syntax is a bit funky but was chosen for simplicity. Some examples:


 * Find files in the China category sorting quality images first.
 * Find files in the China category sorting quality images first.


 * Find files in the China category sorting quality images first and low quality images last.
 * Find files in the China category sorting quality images first and low quality images last.


 * Find files about popcorn sorting quality images first and low quality images last. Remember that through the use of the  message this can be reduced to just.
 * Find files about popcorn sorting quality images first and low quality images last. Remember that through the use of the  message this can be reduced to just.

Don't try to add decimal points to the percentages. They don't work and search scoring is such that they are unlikely to matter much.

A word of warning about : if you add really really big or small percentages they can poison the full text scoring. Think, for example, if enwiki boosted featured articles by a million percent. Then searches for terms mentioned in featured articles would find the featured articles before exact title matches of the terms. Phrase matching would be similarly blown away so a search like  would find a featured article with those words scattered throughout it instead of the article for Brave New World.

Sorry for the inconsistent  in the name. Sorry again but the quotes are required on this one. Sorry also for the funky syntax. Sorry we don't try to emulate the template transclusion syntax like we do with.

insource:

 * Coming with 1.24wmf10.

will search text just in the wikitext. This will pick up template parameter names, URLs in link tags, etc. It has two flavors:
 * and
 * These work pretty similarly to  in that they search the pre-tokenized version of the source.  This should be just as quick as a regular search.  The quoted version searches for phrases in the source.


 * and
 * These run Regular expressions against the page source. They aren't efficient and we only allow a few of them to run at a time on the search cluster, but they are very powerful.  This link contains an explanation of the syntax and this link contains an actual grammar for the regex language. The version with the extra   runs the expression case insensitive and is even more inefficient.

Auxiliary Text
Cirrus considers some text in the page to be "auxiliary" to what the page is actually about. Examples include table contents, image captions, and "This article is about the XYZ. For ZYX see ZYX" style links. You can also mark article text as auxiliary by adding the  class to the html element containing the text.

Auxiliary text is worth less then the rest of the article text and it is in the snippet only if there are no main article snippets matching the search.

Lead Text
Cirrus assumes that non-auxiliary text that is between the top of the page and the first heading is the "lead in" paragraph. Matches from the lead in paragraph are worth more in article ranking.