Dear Zhulin Cai,
Good day! Thank you for posting your query in our community.
Based on your description, you want to export .xmi file from Visio.
I researched a lot on my site, Microsoft Visio doesn't have a built-in feature to directly export to XMI (XML Metadata Interchange) format. XMI is typically associated with UML (Unified Modeling Language) diagrams, and Visio supports UML diagrams but might not have direct support for exporting to XMI.
If you need to export your UML diagrams from Visio to XMI, you may need to use an intermediate tool or a plugin that supports both Visio and XMI.
Appreciate your understanding.
Sincerely,
Jazlyn | Microsoft Community Moderator