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LTER, PASTA, and persistent identifiers

Learn about Persistent Identifiers, schemes like DOIs, LSIDs, and PURLs, and their importance in uniquely identifying digital resources on the internet. Discover how Persistent Identifiers are implemented in LTER and PASTA systems, and how to access metadata and data entities using these identifiers.

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LTER, PASTA, and persistent identifiers

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  1. LTER, PASTA, andpersistent identifiers LTER IMC Water Cooler Series 10-11 January 2011

  2. Water Cooler Objectives • Inform  • Discuss • Listen

  3. What is a persistent identifier? • Persistent identifiers are used to uniquely identify a resource (digital object) on the Internet or other network • "Persistent" such that the resource is addressable regardless of its physical location (notwithstanding security issues) • "Unique" such that the identifier addresses only a single resource within a given scope

  4. Persistent identifier schemes • Handle System/Digital Object Identifiers (DOIs) • protocol:prefix/suffix • e.g., DOI:10.1045/193 or http://dx.doi.org/10.1045/193 • Life Science Identifiers (LSIDs) •  urn:lsid:authority:namespace:object:revision • e.g., urn:lsid:gdb.org:GenomicSegment:GDB132938 • Persistent Uniform Resource Locators (PURLs) • Uses HTTP response code 302 (simple redirect) and redirect to source URL • e.g., http://purl.publisher.com/journal/article_id

  5. Similar approach in all schemes

  6. Persistent Identifiers and LTER EML PackageID = Scope.Identifier.Revision • Scope: a string that logically binds the EML document to a particular namespace • Identifier: a positive integer that is used as an 'accession number' to uniquely identify the EML document as describing a specific data set within a particular namespace • Revision: a positive integer that represents the state of an EML document

  7. Persistent Identifiers and PASTA • Decompose the EML PackageId into RESTful URI patterns <context>/<scope>/<identifier>/<revision>/[entity_name] • Full URI pattern with service Metadata: metadata/eml/<scope>/<identifier>/<revision> Data: data/eml/<scope>/<identifier>/<revision>/<entity_name>

  8. Persistent Identifiers and PASTA 1. Read an EML document with packageId "knb-lter-lno.235.4":         https://pasta.lternet.edu/metadata/eml/knb-lter-lno/235/4 2. List all revisions for EML document "knb-lter-lno.235":         https://pasta.lternet.edu/metadata/eml/knb-lter-lno/235 3. List all revisions for EML document "knb-lter-lno":         https://pasta.lternet.edu/metadata/eml/knb-lter-lno 4. Read data entity "my_data" associated with packageId     "knb-lter-lno.235.4":         https://pasta.lternet.edu/data/eml/knb-lter-lno/235/4/my_data 5. List all data entities associated with packageId     "knb-lter-lno.235.4":         https://pasta.lternet.edu/data/eml/knb-lter-lno/235/4

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