A NOAA Web Services Registry

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A NOAA Web Services Registry
Eugene Burger - PMEL Mark Govett - FSL Ann Keane
- ETL Eric Kihn - NGDC
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Purpose
Establish a standards-based, web service
directory or UDDI to serve as a public registry
of web services and web service providers within
NOAA.
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Why?

• Raise the visibility of web services developed in
  NOAA.
• Inform developers of the availability of web
  services and prevent redundancies.
• Provide authoritative source of information about
  NOAA web services.

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What is a web service?
A Web service is a piece of software that makes
itself available over the Internet and uses a
standardized XML messaging system.

• National Digital Forecast Database
• http//www.nws.noaa.gov/forecasts/xml/
• NDFDgen
• NDFDgenByDay

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WSDL
Web Services Description Language - an XML format
published for describing Web services.
ltdefinitions targetNamespace"http//weather.gov/f
orecasts/xml/DWMLgen/wsdl/ndfdXML.wsdl"gt lttypesgt
ltxsdschema targetNamespace"http//weather.gov/f
orecasts/xml/DWMLgen/schema/ndfdXML.xsd"gt ltxsdim
port namespace"http//schemas.xmlsoap.org/soap/en
coding/"/gt ltxsdimport namespace"http//schemas.
xmlsoap.org/wsdl/"/gt ltxsdcomplexType
name"weatherParametersType"gt ltxsdallgt ltxsdele
ment name"maxt" type"xsdboolean"/gt ltxsdelemen
t name"mint" type"xsdboolean"/gt . . . ltbindi
ng name"ndfdXMLBinding" type"tnsndfdXMLPortType
"gt ltsoapbinding style"rpc" transport"http//sch
emas.xmlsoap.org/soap/http"/gt ltoperation
name"NDFDgen"gt ltsoapoperation
soapAction"http//weather.gov/forecasts/xml/
DWMLgen/wsdl/ndfdXML.wsdlNDFDgen"
style"rpc"/gt ltinputgt ltsoapbody
use"encoded" namespace"http//weather.gov/fore
casts/xml/DWMLgen/wsdl/ndfdXML.wsdl"
encodingStyle"http//schemas.xmlsoap.org/soap/e
ncoding/"/gt lt/inputgt ltoutputgt ltsoapbody
use"encoded" namespace"http//weather.gov/fore
casts/xml/DWMLgen/wsdl/ndfdXML.wsdl"
encodingStyle"http//schemas.xmlsoap.org/soap/e
ncoding/"/gt lt/outputgt lt/operationgt
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What is a UDDI?
Universal Description Discovery Integration - a
platform-independent, XML-based registry designed
to be interrogated by other computers via SOAP
messages and to provide access to WSDL documents
describing the protocol bindings and message
formats required to interact with the web
services listed in the directory.
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Information Contained in UDDI

• Business Entity - the organization providing the
  service
• Business Services - information about the
  services provides
• Binding Templates - information about using the
  service (WSDL)
• Technical Models (tModel) - unique, reusable data
  abstractions

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tModel
UDDI Business Registry Postal Address
Structure UDDI Key (V3)
uddiuddi.orgubrpostaladdress Derived V1,V2
format key uuid48eb2518-c1bd-354f-92c9-21a53b0ff
2b1 ltaddress useTypeNOAA Boulder"
tModelKey"ubr-uddi-orgpostaladdress"gt
ltaddressLine keyName"Street" keyValue"60"gt
Broadway lt/addressLinegt ltaddressLine
keyName"House" keyValue"70"gt 325
lt/addressLinegt . . . ltaddressLine
keyName"Country" keyValue"20"gt US
lt/addressLinegt lt/addressgt
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Categorization

• Taxonomies, Identifiers and Relationships
• Taxonomy
• DOC gt NOAA gt OAR gt Aeronomy Laboratory
• Identifiers
• ISO 3166 Geographic Code System
• Relationships
• peer-to-peer, parent-child, identity

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A real NOAA example
Local forecast by Zip code Search UDDI for
zip2latlon service. Request latitude and
longitude for zip code. Send latitude and
longitude to NDFD web service. Return forecast to
user.
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Selection considerations

• Web-interface
• Authentication based on NEMS/LDAP.
• Standard data representation data portability

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Cape Clear ESB

• Identified and acquired Cape Clear 5.0 aka Cape
  Clear Enterprise Service Bus (EBS)
• Initial demo with Cape Clear 5.5 on Win Platform
• Migrating Cape Clear 6.1 to Linux platform for
  stability, security and sanity (S3).

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Administration Interface
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Business Entry
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Search Interface
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Response
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Considerations

• UDDI is evolving toward a DNS model
• Basic taxonomies and tModels are not applicable
  to NOAA

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Completion

• Web interface
• Register existing services
• Improve metadata
• Investigate UDDI application to Grid computing
  and GIS communities

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UDDI v2 v. v3

• Replication and Tiering
• Digital Signatures
• Human-Friendly Keys
• Subscriptions

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Open Source UDDI

• jUDDI (judy) a java-based UDDI v.2 supported by
  the Apache group. Open source and standards
  based.

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WS Support for Grid Computing

• Investigating WS best practices for configuring
  and initializing model runs
• XML overhead may be too costly for transmission
  in terms of formatting and bandwidth
• HTTP transmission of standard formats (netCDF,
  text) appear more efficient
• Globus toolkit currently implements a Monitoring
  and Discovery System for grid computing
  resources. Need to compare UDDI to MDS.