Hi Bina ---<div><br></div><div>The answer differs for metadata for data and metadata about processes.</div><div><br></div><div>For data, Kepler can utilize metadata from a wide variety of repositories via the 'EcoGrid' SOAP web service interfaces, but mostly it uses the Metacat repository run as part of the KNB network for now. That is what is being searched under the 'Data' tab in Kepler. It supports an extensible set of metadata standards, including EML, DarwinCore, and others. FGDC could be supported as the backend repository supports it, but we don't have a search adapter for FGDC in Kepler as of now -- this could be added. Kepler can also write metadata and data to Metacat through the EcoGridWriter actor.</div>
<div><br></div><div>We also are working on enabling Kepler to work across a much wider variety of data repositories by changes that we are introducing to support the DataONE web service interface. This REST based interface is being promoted by DataONE as a cross-repository interoperability layer, enabling client tools to use a standard set of web services to interact with many repository software systems (e.g., such as Metacat, Mercury, DSpace, Merritt, AKN, and in the future others like iRODS and Fedora). </div>
<div><br></div><div>For metadata about processes, Kepler records provenance traces associated with workflow executions, and can serialize and store those traces and the associated workflows in archive files that can be uploaded to a repository. Right now we run one repository for these workflow/provenance artifacts for Kepler itself, but I've heard that others run the repository systems themselves to have local repositories that they can use for their work. The Kepler Workflow Run Manager and Provenance modules handle these features. This provenance metadata system also uses the EcoGrid services to read and write archives on remote repositories, and I expect this will also be a subject of future DataONE work to enable cross-repository interoperability.</div>
<div><br></div><div>In addition, there is a working group focused on coming up with a cross-workflow metadata specification for provenance that is an extension of the OPM model. I expect that work will be incorporated in Kepler, Taverna, and other workflow systems as it matures. See <a href="https://www.dataone.org/content/scientific-workflows-provenance-working-group">https://www.dataone.org/content/scientific-workflows-provenance-working-group</a>.</div>
<div><br></div><div>These features are all described in the Kepler documentation (the provenance system is described in the associated run manager and provenance module documentation), all of which is available here:</div>
<div> <a href="https://kepler-project.org/users/documentation">https://kepler-project.org/users/documentation</a></div><div><br></div><div>Hope this helps.<br><br><div class="gmail_quote">On Tue, Dec 6, 2011 at 12:09 PM, Bina Philip <span dir="ltr"><<a href="mailto:binabhas@umail.iu.edu">binabhas@umail.iu.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">Hi,<br><br>Does Kepler have a metadata repository? I am trying to find out if Kepler stores metadata that could emerge out of a particular workflow, if it does support metadata capture then what schemas does it support? For reference to what exactly I am trying to inquire about please refer to this link of FDGC schema <a href="http://www.fgdc.gov/metadata" target="_blank">http://www.fgdc.gov/metadata</a>. I am trying to see if there is a way that kepler captures metadata in such schema. Kindly shed some light on this topic.<br>
<br>Best<br clear="all"><font color="#888888"><br>-- <br>Regards,<br>Bina<br>Indiana University Bloomington<br>Dept Of Computer Science (Master's).<br>Contact:- <a href="tel:812-327-4780" value="+18123274780" target="_blank">812-327-4780</a><br>
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