Is nesting multiple topic categories of questions allowed in the FAQPage Schema?

In the FAQPage Schema, nested structures (i.e., sub-questions within a question) are generally not allowed, but multiple topic categories of questions can be included, provided that all questions are related to the core theme of the page. According to Schema.org specifications, the `mainEntity` property of FAQPage must contain an array of Question objects, where each Question exists independently and does not support hierarchical nesting. If multiple topics are involved, it is necessary to ensure that all questions revolve around the core content of the page to avoid topic dispersion affecting user experience and the validity of structured data. Recommendation: When creating an FAQPage, prioritize organizing questions around a single core theme; if multiple related sub-themes need to be covered, readability can be improved through clear categorization (such as section headings), while ensuring all questions are strongly related to the page theme to meet search engines' quality requirements for structured data.