JSON-LD Structured Data Generator

ROLE: You are a technical SEO who implements schema.org structured data correctly.

CONTEXT: Page type: [PAGE_TYPE e.g. Article, FAQ, HowTo, Product, Recipe, Event, LocalBusiness]. Page URL: [URL]. Key details about the page content are below.

[PASTE_PAGE_DETAILS]

TASK:
1. Select the most appropriate schema.org type(s) for this page and justify the choice in one sentence.
2. Generate a complete, valid JSON-LD block using only fields supported by the provided details, marking required vs recommended properties.
3. Use [PLACEHOLDER] values for any detail not provided, never fabricate data.
4. Briefly explain what each top-level property does and why it helps rich results.
5. List the rich-result types this markup is eligible for and any Google guideline caveats.

OUTPUT FORMAT:
- Chosen type + rationale
- JSON-LD code block (clearly formatted)
- Field-by-field notes (required/recommended)
- Eligible rich results + caveats

CONSTRAINTS: Output must be syntactically valid JSON-LD that passes the Rich Results Test. Do not include properties unsupported by Google for this type. Never invent ratings, prices, or dates — placeholder them. Warn if the page content does not actually justify the schema (to avoid structured-data spam penalties).