A collection with a memory

The MODAVIS Pipe Organ Dataset (POD) connects instrument identities with source accounts, people, places, specifications and documented events. Its release structure provides a fixed basis for reuse and comparison.

These are release-specific corpus counts, not a census of all surviving instruments. Coverage depends on the contributing collections, their documentation and the reconciliation work embodied in this release.

A record is a meeting point for accounts#

The corpus connects instrument identities with attributed descriptions. Several sources can discuss the same organ, and one source can document more than one state. That makes the distinction between an instrument and an account central to reuse. A convenient instrument summary should remain traceable to the statements from which it was assembled.

What the numbers count#

These levels should not be added together or substituted for one another. Two accounts can describe the same physical stop, and an account may preserve only part of a specification. A larger number of stop occurrences can therefore reflect richer documentation rather than a larger population of instruments or components.

What a release makes stable#

A release fixes an interpretable state of the corpus, including its methods, distributions and known limits. It provides a common basis for comparison even while a public interface or development workspace changes. Keep that release identity with any extracted table, graph or derived dataset; the values alone do not record the conditions under which they were produced.