{"id":6,"date":"2019-10-25T05:46:26","date_gmt":"2019-10-25T05:46:26","guid":{"rendered":"https:\/\/arms10.org\/publication\/?p=6"},"modified":"2020-01-31T06:13:29","modified_gmt":"2020-01-31T06:13:29","slug":"the-designing-of-web-services-to-deliver-web-documents-associated-with-historical-links","status":"publish","type":"post","link":"https:\/\/arms10.org\/publication\/the-designing-of-web-services-to-deliver-web-documents-associated-with-historical-links\/","title":{"rendered":"The Designing of Web Services to Deliver Web Documents Associated with Historical Links"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

The historical links of a web site include the URLs invalidated due to web site reorganization, document removal, renaming or relocation, or links to document snapshots, which are defined as the document\u2019s contents as of a specific point in time. Tracking historical links will allow users to use out-of-date URLs, retrieve removed documents and document snapshots. This paper presents a logging and archiving scheme to track a document\u2019s history of changes, and designs a web service to deliver the web document associated with a historical link. <\/p>\n\n\n\n

\n\nA web site is a system of integrated web documents\nembedded with links to reference related documents. At\nany given time, a Uniform Resource Locator (URL)\nuniquely identifies a document on the Internet. The\nURLs of all web documents currently published by a web\nsite are web site\u2019s current links. One of the basic services\nof a web server is to deliver the document associated with\na URL submitted by users. However, not all URLs\nsubmitted to a website are valid. There are many causes\nthat will render an old URL invalid: the host may\nreorganize by changing its directory structure, hence\nchanging the path to a document; a document may be\nrenamed, deleted, or moved to a different directory. The\ndocument may no longer exist or have a new URL.\nEven valid URLs don\u2019t necessarily retrieve the user\u2019s\ndesired document considering the following two\nsituations: (1) The relationship between URL and web\ndocument is m:m where each URL may be associated\nwith many documents and each document may be\nassociated with many URLs overtime. A URL may point\nto a document that is different from the one it pointed to\nearlier. This may happen because of the renaming of\ndocuments and directories. For instance, a document A\nmay be renamed to C and another document B may be\nrenamed to A; hence the URL originally pointing to A is\nnow point to a different document. On the other hand, a\nweb document will have a different URL when it is\nrenamed or moved to a different directory. (2) A\ndocument may have gone through several changes. A\nURL typically retrieves the current version of a document\nand its contents may be different from the last download.\nThere are times when users would like to see the previous\nversions of a document. These previous versions are\nsnapshots of a document as of a specific point in time.\nStudying a document\u2019s snapshots may help users identify\ntrends and patterns of changes in a document.\nTogether, the URLs invalidated by a web site due to\nreorganization, document removal, renaming, or\nrelocation, plus the links to document snapshots are a web\nsite\u2019s historical links. Maintaining historical links\nenables a web site to retrieve the document associated\nwith an out-of-date URL submitted by users, deleted\ndocuments, and document\u2019s snapshots. This will improve\na web site\u2019s ability in searching documents and provide\nneeded historical information for users.\nThis research has two objectives: First it presents a\nlogging scheme to track historical links by recording the\ntime and the type of changes that occurred to a document\nand the document\u2019s URL and an archiving to retrieve\ndocument snapshots and deleted documents. Tracking\nchanges has been the research topic in many areas such as\nmanaging database snapshots [1], materialized views [4],\nand document versions [6]. Using a log to record changes\n[2] [3] and archiving the many versions of a document are\ntypical methods in tracking changes. Second, it designs a\nweb service to deliver the web document associated with\na historical link. Web server is designed to retrieve\ncurrent document associated with a URL. Retrieving\ndocument associated with a historical link requires\ndedicated programs to work with the logging scheme.\nAlthough these programs may be implemented in many\nways, such as server-side scripts, implementing them as a\nweb service has the benefits of assembling related\nprograms in one service and the flexibility in integrating\nwith systems that need historical documents.\nIn the following paper, Section 2 presents an analysis\nof the problem; Section 3 presents the logging and\narchiving scheme; Section 4 presents the algorithms for\nprocessing historical links and web service design; and\nSection 5 is a summary. \n\n<\/p>\n","protected":false},"excerpt":{"rendered":"

The historical links of a web site include the URLs invalidated due to web site reorganization, document removal, renaming or relocation, or links to document snapshots, which are defined as the document\u2019s contents as of a specific point in time…. 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