A Bit of GLUe for the VO: Aladin Experience
A Bit of GLUe for the VO: Aladin Experience
复制标题
VO 的一些 GLUe：阿拉丁体验
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
T. Boch
中科院分区：
文献类型：
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作者：
P. Fernique;A. Schaaff;F. Bonnarel;T. Boch
在这篇文章中，我们描述了GLU系统（统一链接生成器）如何允许Aladin浏览工具通过单个接口集成多个图像和数据服务器。我们描述了它是如何工作的，它是如何更新的，以及它是如何在Java上下文中实现的。我们还提出了未来的发展，我们预见的GLU系统，以允许与新兴的Web服务的互动。1.互操作性需求Aladin现在被广泛认为是一种用于显示和交叉匹配异构数据和图像的工具，可以预测未来的VO门户。它提供了对Simbad、VizieR、CDS图像服务器（DSS、MAMA、2 MASS）、NED、SkyView和SuperCosmos数据库、NVSS和FIRST档案以及CFHT、Chandra、HST、HUT、ISO、IUE和Merlin等使命日志的透明访问。像任何互操作性工具一样，Aladin需要回答以下问题：1.如何访问数据服务器？查询的语法是什么？2.如何动态地构建到数据服务器的接口？3.如何操作服务器结果？使用哪种语法/标准？4.如何更新前面问题所要求的信息？谁必须这么做？Aladin使用GLU系统来回答这些问题。2. GLU系统是Web服务器描述的分布式存储库。它是由斯特拉斯堡的Données天文学中心（CDS）于1996年设计和编写的。目前，GLU管理着遍布全球的30个复制站点和大约500个Web资源描述。GLU资源描述，也称为GLU记录，通常包含资源的唯一标识符、简短描述、用于查询资源的URL模板以及描述查询参数的数据类型的附加信息。后者可能包括天体坐标、天体名称、书目代码等。结果的格式，VOTable，FITS图像，HTML页面等也必须包括在内。
In this article we describe how the GLU system (Uniform Link Generator) allows the Aladin browsing tool to integrate several image and data servers through a single interface. We describe how it works, how it is updated and how it is implemented in a Java context. We also present the future evolution we foresee for the GLU system in order to allow interaction with the emerging Web Services. 1. Interoperability Needs Aladin is now widely known as a tool to display and cross-match heterogeneous data and images anticipating future VO portals. It offers transparent access to Simbad, VizieR, CDS image servers (DSS, MAMA, 2MASS), NED, SkyView and SuperCosmos databases, NVSS and FIRST archives, as well as mission logs such as CFHT, Chandra, HST, HUT, ISO, IUE and Merlin. Like any interoperability tool, Aladin needs to answer the following questions: 1. How to access the data servers? What is the syntax of the query? 2. How to dynamically build interfaces to the data servers? 3. How to manipulate the server results? Which syntax/standard is used? 4. How to update the information required by the previous questions? Who has to do that? Aladin makes use of the GLU system to answer these questions. 2. GLU Functionalities The GLU system is a distributed repository of Web server descriptions. It was designed and written in 1996 by the Centre de Données astronomiques de Strasbourg (CDS). Presently, the GLU manages thirty replicated sites all over the world and about five hundred Web resource descriptions. A GLU resource description, also called a GLU record, typically contains a unique identifier for the resource, a short description, a URL template to query the resource, and additional information describing the data type of the query parameters. The latter may include celestial coordinates, astronomical objects designations, bibliographic codes and so forth. The format of the results, VOTable, FITS image, HTML pages etc must also be included.