What is attr-cm?

There's no widely known or established software, library, or tool called "attr-cm". It's possible:

• It's a very niche or internal project: The name might be specific to a company or a very small community.
• It's a typo: Perhaps you meant a similar-sounding name. Could you double-check the spelling or provide more context (where you encountered this term)?
• It's a newly emerging project: Very new projects might not have extensive online documentation yet.

To help me find information, please provide more context, such as:

• Where did you see this term? (A website, a book, a code repository, etc.)
• What is the context? (What problem is it supposed to solve? What kind of technology is it related to?)

With more information, I might be able to help you find what you're looking for.