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--- wiki:m0 [2023/09/20 20:15] – esoeding
+++ wiki:m0 [2023/12/19 15:54] (current) – [Description] esoeding
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 **Recommendation M0 **
-======Recommendation to use PIDs to refer to frequently used redundant metadata wherever posssible======
+======Recommendation to use stable PID systems to refer to frequently used redundant metadata wherever possible======
 =====Description=====
-Status:
+Status: ~~LASTMOD~~
 =====Motivation for this Recommendation: =====
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 __About__
+Defintion of PIDs
+  * A persistent identifier (PI or PID) is a long-lasting reference to a document, file, web page, or other object (from Wikipedia).
+  * PID registers typically store core metadata with the PID
+  * PIDs are used in data infrastructures to link to common information
+  * Harmonizing the use of PIDs may improve interoperability of datasets between data repositories
+Criteria for the evaluation of PID Systems
+  - PID is globally unambiguously registerable
+  - PIDs are widely used, e.g. recommended by national and international organizations
+  - PID registrar has transparent governance
+  - Handle system has stable funding
+  - PID system is reliably available and maintained
+  - PIDs have an adequate metadata set
+  - PID registration is open to all (vs. paying users only)
+  - PID is machine readable via API
+  - Further developments are downward compatible (with previous updates, content and technical)
+  - Also: What other PID systems capture the same types of data?
 __History and structure__