Does the FAQPage Schema support custom extended attributes?

When additional information not covered by standard fields needs to be supplemented in the FAQPage Schema, it is usually supported through custom extension properties, but the extension specifications of Schema.org must be followed. The use of custom extension properties must meet two core conditions: - Naming convention: A unique namespace (such as a company domain prefix) must be used to avoid conflicts with Schema.org standard properties, e.g., `example:customAttribute`. - Compatibility: It is necessary to ensure that existing standard properties (such as `mainEntity`, `name`, `acceptedAnswer`) are not overwritten or modified, and only exist as supplementary information. It should be noted that major search engines (such as Google and Bing) have limited support for the recognition and display of custom properties, which may only be parsed in specific scenarios (such as vertical industry searches). It is recommended to first use the standard properties defined by Schema.org to complete the basic markup, and then carefully add custom extension properties when necessary. Validate the effectiveness through [Google's Rich Results Test tool](https://search.google.com/test/rich-results) to ensure that the search display of core FAQ content is not affected.