Traditional search engines are based on information retrieval technologies . they implement operations such as boolean queries , proximity searches , text relevance and link analysis 自己簡單翻譯一下:傳統(tǒng)的搜索引擎是基于信息檢索技術。他們執(zhí)行諸如布爾查詢的操作,近似搜索,正文關聯(lián)和連接分析。
The thesis simplely discusses three question about content query : simple query ( also called matching ) , field query and boolean query . the thesis gives five basic path query expression , namely simple regular path expression , order regular path expression , attribute regular path expression , value regular path expression and kleen closure regular path expression . the thesis summarizes four operation for the five basic regular path expression : pc operation ( parent - child ) , ad operation ( ancestor - descendant ) , co operation ( containment ) , or operation ( order ) 在研究結構查詢技術時,本文提出了五種基本的路徑表達式,即簡單路徑表達式、含序路徑表達式、屬性路徑表達式、含值路徑表達式和kc路徑表達式,本文研究了這五種基本路徑表達式的實現(xiàn)方式,通過分析這五種路徑表達式的實現(xiàn),筆者提出了四種針對結構信息的基本操作,即pc操作、 ad操作、 co操作和or操作。