[Download]
[Documentation][Metadata Schema Repository]
Introduction
The Resource Catalog (aka ResCat) service provides scalable registration and location of public resources
available in the LEAD space, along with the metadata describing them.
Resources include data products, individual files and collections (DataCatalog part of ResCat) and
web-services (ServiceCatalog part of ResCat), but can be generalized to any network reference-able entity
with metadata. The metadata is resource specific: a variation of FGDC, called the LEAD Metadata Schema, is used for data products;
WSDL, Service Maps,
Host maps, etc. are used for web-service resources. A web-service API is provided to manage the
resource registrations (add, update, delete) and querying for them based on their metadata. The catalog is
primarily populated by crawling known THREDDS catalogs, publishing
collection from myLEAD, and by web-services
being registered. It can be used to select services when composing workflows, locate service maps for creating
services thro' the application factory, searching for
input data products for workflows, etc.
The Resource Catalog is derived from the deprecated VO Catalog project that was
part of the GSXOGSI
Grid Service Registration portType and was used to register
Grid services and data products as OGSI ServiceGroupEntries. The
resource catalog sheds the conformance to the now deprecated OGSI
specification and is designed as a plain web-service.
toolkit. The VO Catalog was an implementation of the
Current Status
ResCat's service catalog currently supports registration of Service Maps,
Host maps, Abstract WSDLs, Concrete WSDLs and generic XML documents with it.
It provides a web-service API using
XSUL
to add, delete, and query by ID for these documents. It also supports
supports XQueries over these
XML documents and uses the
Sleepycat Berkley DBXML database for storing the XML documents
natively.
Lifetime management is provided for the Concrete WSDLs. A client
side utility library
to invoke the service and a command line shell for accessing the
catalog are available. A web search interface for querying concrete
WSDLs is also available
here.
The WSDL for the web-service API can be found
here.
The data catalog part of ResCat supports registration of data collections available as THREDDS catalogs or provided
as LEAD Metadata documents conforming to the XML schema.
Once registered, the THREDDS catalogs are crawled
using a metadata crosswalk to convert them to the LEAD Metadata schema, and indexed in the
Lucene index.
LEAD Metadata documents sumbitted in LEAD metadata schema are directly indexed without requiring crawling. The
catalog can be searched for using the web-service API or the commandline client. Geo-Gui, a graphical
portlet interface for querying the default LEAD data catalog, is also available
here.
Downloads
Resource Catalog v0.4.7 (2006-06-10)
Resource Catalog v0.3.6 (2006-05-01)
Resource Catalog v0.3 (2006-02-18) [Service and Data catalogs for ResCat]
Resource Catalog v0.1alpha (2005-11-21) [alpha release that includes data catalog from deprecated VO Catalog]
Resource Catalog v0.0.6 (2005-06-09)
VO Catalog v1.2_SC2004 (2004-11-07)
Documentation
- Draft paper with brief description of ResCat architecture, functionality, and its role in
the LEAD Cyberinfrastructure
- [README]
and [CHANGES]
file in resource catalog distribution
- Client Javadocs for Resource Catalog v0.4.6
- Information about GSX
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