schemaview.py: `namespaces` function gives different results if imports have not been processed

[ialarmedalien]

---

name: Bug report
about: schemaview.py's namespaces function
title: 'schemaview.py: namespaces function gives different results if imports have not been processed'
labels: bug
assignees: 'ialarmedalien'

---

Describe the bug

The namespaces function in schemaview.py gives different results, depending on whether or not a function has been executed that processes the imports closure. If namespaces is run directly after initialising a SchemaView instance, the prefixes from any imported schemas will not show up in the schema namespaces. Unfortunately, the results of this function are cached, so subsequent calls to namespaces will not be updated with the imported prefixes.

PR to add tests for the namespaces function:

https://github.com/linkml/linkml-runtime/pull/472/files

Assuming that this is a bug and not a feature, a fix is simple to implement.

[Silvanoc]

@ialarmedalien Have to tried to identify the author of the problematic code using blame and pull her/him into this issue to confirm if it's a bug or a feature?

[ialarmedalien]

No -- it looks like it's original code from when the module was added to the repo.

@cmungall see above. Feature or bug?