Yes it is. BOMA provides content that is specific to your country and region e.g. tax technical, news such as government budget announcements, seasonal content or articles based on time in the financial year for your region).
You will also see articles that are globally applicable and available to all regions.
Further Reading:
Accessing Xero guides and content in BOMA
How to enter a library access code to unlock a premium library in BOMA
How do I select content from the content library for my campaign?
Using BOMA content on your website or blog
BOMA content library attribution