手机美篇客服电话:各位高手,哥哥姐姐们,帮帮忙啊,我头都大了,翻译的来看,有悬赏分!!!!

As the demand for data-intensive Web sites increases,
the demand for tools to help create and maintain such sites
Correspondence to: Mary Fern´andez
also increases. Because data-intensiveWeb sites are typically
hard to specify and implement, commercial vendors and academic
researchers are actively developing methods and tools
for building sites. Although the goals of the myriad solutions
differ, most attempt to isolate and automate the common
tasks of Web-site development. These include: (1) choosing
and accessing the data that will be displayed at the site;
(2) designing the site’s content, i.e., specifying the data contained
within each page; (3) designing the site’s structure,
i.e., specifying the navigational links between pages; and
(4) designing the visual presentation of pages.
In common practice, data-intensive Web sites usually
are not implemented by automated tools, but by groups
of loosely related programs written in imperative scripting
languages, such as Perl. Scripting languages are wellsuited
for “gluing” together other software components [24],
which makes them popular for constructing Web sites. The
scripts for many site implementations, however, interleave
the code for data access and integration, page construction,
and HTML generation. As a result, important sitemanagement
tasks, such as automatically updating or restructuring
a site, optimizing a site’s performance based on
common page-access patterns, or enforcing integrity constraints
on a site’s structure, are tedious to perform and difficult
to automate.