Data (XML) Web resources
Use Data (XML) Web resources to save and access data.
Capabilities of XML Web resources
Use XML Web resources to cache data that you want to use in your solution.
Limitations of XML Web resources
Use XML Web resources to cache configuration settings or metadata for your solutions.
An XML Web resource does not represent a robust solution for data that is frequently updated by multiple users. While one user is updating an XML Web resource, another user (or automated process) could update the Web resource and that data would be lost when the first user saves their changes.
All XML files must use the .xml file name extension. Files that use XML data but do not use the .xml file name extension cannot be uploaded as Web resources unless the file name extension is changed.
Web Resources for Dynamics 365 Customer Engagement (on-premises)
Using Web Page (HTML) Web Resources
Using Style Sheet (CSS) Web Resources
Using Script (JScript) Web Resources
Using Image (JPG, PNG, GIF) Web Resources
Using Silverlight (XAP) Web Resources
Using Stylesheet (XSL) Web Resources