constraint n. 1.強(qiáng)迫,拘束。 2.約束,壓抑,拘泥。 3.強(qiáng)制力。 4.緊張感[狀態(tài)]。 by constraint 勉強(qiáng),強(qiáng)迫。 feel constraint覺(jué)得局促不安,感受壓迫。 show constraint顯得局促。 under [in] constraint 被迫,不得不;被束縛著。
Secondly, using web data charactors, the paper is to build relational abstractions of large and fairly well-structured web sites and to use an optimizer to translate declarative queries on these relational abstractions to efficient navigation plans . we use a simple subset of the araneus data model ( adm ) to describe web sites . this adm scheme is augmented with link constraints that capture the redundancy present in many web sites . this paper also use inclusion constraints that state that all the pages that can be accessed using a certain path can also be accessed using another path 本論文使用adm(thearaneusdatamodel)數(shù)據(jù)模型的一個(gè)子集來(lái)描述web網(wǎng)站。這種基于叭花b視圖高效查詢(xún)系統(tǒng)的研究摘要adm數(shù)據(jù)模型是依靠增加鏈接約束來(lái)獲取網(wǎng)站上的冗余。論文使用包含約束(inclusionconstraini),它規(guī)定所有能被一個(gè)確定的路徑訪問(wèn)到的頁(yè)面,同樣也可以使用另一條路徑訪問(wèn)到頁(yè)面。