Schedule of Releases (since Tromso meeting) and New Access Interfaces

Schedule of Releases MD9.1 (internal release) (May 25, 2004) –ISO compatible MD9.2 (IDN release) (July 2004) –ISO compatible –Decoupled software into several packages. –Several packages available for download MDServer, KeywordSearch, OpenAPI, docBUILDER, OPS, etc. –Packaged release for instillation Delivered to JCADM node –Incorporation of a geographic map showing spatial coverage of data set in DIF display.

Schedule of Releases MD9.3 (Oct 2004) –Incorporation of Lucene full-text search engine with geo- spatial and temporal searching. –Integrate and combine keyword searching with full-text searching using Lucene. –Incorporation of spell checker for docBUILDER. –PostgresSQL support. –Improved installer for database installation and software configuration. –New Subscription Service provides users ability to subscribe to DIFs by topic. Also provides a way to subscribe to keyword changes.

Schedule of Releases MD9.4 (Mar 2005) –Incorporate hierarchical searching for locations and data center (and refinement). –Incorporate capability to search/refine by Data Resolution. –Incorporate SOAP as API to access GCMD catalog server. (may be available in earlier release) –Improve catalog level searching by allowing clients to search content using Xpath queries. (may be available in earlier release)

docBUILDER Web Application –Implement templates –Editable XML content box. –Render tab to view XML in HTML –Improve underlying data structures to provide faster DOM access. Swing Application –Implement standalone version of docBUILDER (e.g., CD version, not necessary to be connected to the internet)

Databases Provide open-source alternatives to Oracle. –PostgreSQL –MySQL –Mckoi

Providing Extended Access to the IDN SOAP offers a new way to interact with the IDN Walter Lowe: Summer, 2004

The IDN Web Interface

The docBuilder Web Interface

How is Information Accessed in the IDN?

The Remote Method Invocation (RMI) System

About SOAP Extensible Markup Language (XML) Communication between computer systems Simple Object Access Protocol (SOAP) Transmission of information and commands Web Services Description Language (WSDL) Implementation independent description of interfaces

Extending the RMI Server

The Advantages of a Distributed System

Applications for the System Automated access and update Examination of coverage area Custom interface design Integration into existing applications

XML Query Language Project Dennis Petesch. Summer 2004

Goal Provide support by implementing a Java- based parser that will query the IDN Database using XML XPath expressions (Standardized XML based query language) instead of the current in-house query language.

Research Questions XPath? The primary purpose of XPath is to address certain criteria of an XML document through the hierarchal navigation of an XML document. Will XPath be sufficient in filtering XML Metadata? Can I use XPath to exactly pinpoint certain information?

Approach Practice XML and Java Research XPath functionality Research Database functionality Testing XPath expressions Black box testing Open Source XML database from eXist, Xindice

ATMOSPHERE ATMOSPHERIC PHENOMENA STORMS ATMOSPHERE ATMOSPHERIC ANOMOLIES HURRICANES XML EXAMPLE

GCMD Query Language [Location:Location_Name=NORTH AMERICA] OR ([Source_Name:Short_Name=LANDSAT] AND [Project:Short_Name=DODS]) Grouping ()s [Location:Location_Name=NORTH AMERICA] AND [Source_Name:Short_Name=LANDSAT] Boolean Queries [Entry_ID=ZZZ415] Simple Queries

/DIFS/DIF[Entry_ID/text()=ds018.0][Entry_ID=ds018.0] XPathGCMD Query Language EXAMPLE

/DIFS/DIF[Location/Location_Name/ text()=NORTHERN HEMISPHERE and Data_Set_Language/text()=English] [Location:Location_Name= NORTHERN HEMISPHERE ] AND [Data_Set_Language=English] XPathGCMD Query Language Grouping() Boolean

Database Comparison Exist Open Source Written in Java Makes use of GUI Supports XPath & XQuery 2^31 small documents Minimal command line documentation XINDICE Open Source Written in Java Makes use of GUI Does not support XQuery Many small documents Maintained by Apache

Results Xindice XML database fit requirements, plus it made easier use of the command line. Use a soap interface to interact with the user. The soap interface would tell the XML database what to search for, and then the formatted results would be displayed to the user on a web page.

Visualization