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Avainsana

Avainsana on tiedonhaussa ja indeksoinnissa käytetty viittaus tietokokonaisuuteen. Teknisesti avainsana on merkkijono, johon liittyy linkki tai muu osoitin siihen kohteeseen, johon se viittaa. Avainsanoja käytetään erilaisissa hakemistoissa ja kortistoissa, nykyisin myös tietokannoissa. Käyttäjälle avainsanat näkyvät esimerkiksi hakukoneissa ja muissa tietolähteiden hakemistoissa.

Avainsanan merkitys ja tehtävä voidaan ymmärtää eri tavoin: sen voidaan ajatella olevan tietystä näkökulmasta tehty tiivistelmä kohteestaan, mutta toisaalta se voidaan nähdä myös kohteessa olevan yksittäisen käsitepiirteen tai semanttisen piirteen edustajana. Etenkin jälkimmäisessä tapauksessa on luontevaa, että tiettyä kohdetta vastaavia avainsanoja on useita.

Avainsanat tuotetaan joko automaattisesti indeksointiohjelman avulla tai sisällönkuvailijan, esimerkiksi kirjastonhoitajan tai informaatikon suorittamassa indeksointiprosessissa. Avainsanat voivat olla suoraan dokumentissa esiintyviä tai niistä muokattuja. Avainsana voi olla vapaa tai tietyn sanaston, tesauruksen mukainen. Jälkimmäisessä tapauksessa avainsanoja nimitetään asiasanoiksi.

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13 ← 12 13 14 → 数表 — 整数 <<  10 11 12 13 14 15 16 17 18 19 >> 命名數字13小寫十三大寫拾參序數詞第十三thirteenth識別種類整數性質質數第6個11 - 13 - 17質因數分解(素数)表示方式算筹希腊数字ΙΓ´ 羅馬數字XIII 巴比伦数字

 

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British television series The A ListGenre Teen drama Mystery Thriller Created by Dan Berlinka Nina Metivier Starring Lisa Ambalavanar Ellie Duckles Savannah Baker Cian Barry Eleanor Bennett Jacob Dudman Benjamin Nugent Rosie Dwyer Jack Kane Max Lohan Nneka Okoye Micheal Ward Georgina Sadler Indianna Ryan Dan Brady Byron Easman Barnaby Tobias Finty Williams ComposerNick FosterCountry of originUnited KingdomOriginal languageEnglishNo. of series2No. of episodes21ProductionExecutive producers Ann...

 
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