What is a Product LID?

This is a PDS4 feature. To keep the PDS4 data archive organized, every product is assigned a unique identifier. This Logical Identifier (LID) is not only unique to your archive but is unique through all PDS.

LID Format

urn:nasa:pds:<bundle_id>:<collection_id>:<product_id>

Rules

LIDS are constructed by concatenating fields of characters. The fields are separated by colons.

• LIDs are restricted to lower-case letters, digits, the dash, the period, and the underscore.

• Bundle LIDs are constructed by appending a unique bundle-specific identifier to the agency identifier, such as urn:nasa:pds.

  Bundle LID = urn:nasa:pds:<bundle_id>

  Since all PDS bundle LIDs are constructed this way, the bundle LID will be globally unique.

• Collection LIDs are constructed by appending a unique collection identifier to the parent bundle’s LID, for example:

  Collection LID = urn:nasa:pds:<bundle_id>:<collection_id>

  Since all PDS collection LIDs are constructed in this way and the collection identifier is unique within the bundle, the collection LID will be globally unique.

• Basic Product LIDs are constructed by appending a unique product identifier to the parent collection’s LID.

  Product LID = urn:nasa:pds:<bundle_id>:<collection_id>:<product_id>

  Since the product LID is based on the collection LID, which is unique across PDS, the product LID will be globally unique.

Source of information from PDS4 Standards.