Generic XML-based framework for metadata portals

被引：20
|
作者：
Schindler, Uwe [1 ]
Diepenbroek, Michael [1 ]
机构：
[1] Univ Bremen, Ctr Marine Environm Sci MARUM, D-28359 Bremen, Germany
来源：
COMPUTERS & GEOSCIENCES | 2008年 / 34卷 / 12期
关键词：
Spatial data infrastructure; Metadata portal; Metadata standard; Open archives; Full-text search; Apache Lucene;
D O I：
10.1016/j.cageo.2008.02.023
中图分类号：
TP39 [计算机的应用];
学科分类号：
081203 ; 0835 ;
摘要：
We present a generic and flexible framework for building geoscientific metadata portals independent of content standards for metadata and protocols. Data can be harvested with commonly used protocols (e.g., Open Archives Initiative Protocol for Metadata Harvesting) and metadata standards like DIF or ISO 19115. The new Java-based portal software supports any XML encoding and makes metadata searchable through Apache Lucene. Software administrators are free to define searchable fields independent of their type using XPath. In addition, by extending the full-text search engine (FTS) Apache Lucene, we have significantly improved queries for numerical and date/time ranges by supplying a new trie-based algorithm, thus, enabling high-performance space/time retrievals in FTS-based geo portals. The harvested metadata are stored in separate indexes, which makes it possible to combine these into different portals. The portal-specific Java API and web service interface is highly flexible and supports custom front-ends for users, provides automatic query completion (AJAX), and dynamic Visualization with conventional mapping tools. The software has been made freely available through the open source concept. (c) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1947 / 1955
页数：9
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