Schedule of Releases (since Tromso meeting) and New Access Interfaces
Mar 27, 2015
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