Schedule of Releases (since Tromso meeting)

and New Access Interfaces

Schedule of Releases• MD9.1 (internal release) (May 25, 2004)

– ISO 19115 compatible

• MD9.2 (IDN release) (July 2004)– ISO 19115 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

<?xml version="1.0" encoding="ISO8859-1" ?> <DIF>

<Parameters> <Topic>ATMOSPHERE</Topic> <Term>ATMOSPHERIC PHENOMENA</Term> <Variable>STORMS</Variable></Parameters><Parameters> <Topic>ATMOSPHERE</Topic> <Term>ATMOSPHERIC ANOMOLIES</Term> <Variable>HURRICANES</Variable></Parameters></DIF>

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