International audienceThe constantly growing amount ofWeb content and the success of the SocialWeb lead to increasing needs for Web archiving. These needs go beyond the pure preservationo of Web pages. Web archives are turning into “community memories” that aim at building a better understanding of the public view on, e.g., celebrities, court decisions and other events. Due to the size of the Web, the traditional “collect-all” strategy is in many cases not the best method to build Web archives. In this paper, we present the ARCOMEM (From Future Internet 2014, 6 689 Collect-All Archives to Community Memories) architecture and implementation that uses semantic information, such as entities, topics and events, complemented with information from the Social Web to guide a novel Web crawler. The resulting archives are automatically enriched with semantic meta-information to ease the access and allow retrieval based on conditions that involve high-level concepts
The World Wide Web is the largest information repository available today. However, this information is very volatile and Web archiving is essential to preserve it for the future. Existing approaches to Web archiving are based on simple definitions of the scope of Web pages to crawl and are limited to basic interactions with Web servers. The aim of the ARCOMEM project is to overcome these limitations and to provide flexible, adaptive and intelligent content acquisition, relying on social media to create topical Web archives. In this article, we focus on ARCOMEM's crawling architecture. We introduce the overall architecture and we describe its modules, such as the online analysis module, which computes a priority for the Web pages to be crawled, and the Application-Aware Helper which takes into account the type of Web sites and applications to extract structure from crawled content. We also describe a large-scale distributed crawler that has been developed, as well as the modifications we have implemented to adapt Heritrix, an open source crawler, to the needs of the project. Our experimental results from real crawls show that ARCOMEM's crawling architecture is effective in acquiring focused information about a topic and leveraging the information from social media. Future Internet2014, 6 519
It is The National Archives' responsibility to collect and secure the future of the public record in all its forms and to make it as accessible as possible. The UK Government Web Archive1 (UKGWA) effectively preserves the open digital record. This article will explore the challenges encountered, and the Application Programming Interface (API) based solutions developed, by The National Archives and the Internet Memory Foundation (IMF) in the completion of a pilot project to capture the record as it is published on the social media services Twitter and YouTube. An outline of the wider web archiving programme and its role within the management of the government web estate is provided. The legislative framework that guides web archiving at The National Archives is described as it has necessarily influenced the policy decisions that shaped the solutions developed. A brief overview of some comparative approaches taken by other organizations and commercial services to capturing Twitter content is also presented as context to the policy and technical solutions arrived at by the authors. The National Archives has sought to develop the building blocks of a collection whose growth can be sustained over time. The publication of this part of the archive will be followed by further evaluation and improvements to the initial approach taken.
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