Metadata library policy
Purpose
This site may provide structured metadata you maintain or derive for engineering work (standard identifiers, versions, supersession relationships, piping material specification rules, project snapshots, and export manifests). It does not replace official publications.
No distribution of third-party PDFs
We do not provide original standard specifications, standard atlases, design manuals, product catalogs, professional books, professional literatures, or other engineering reference PDF files to third parties through this website. Users must obtain licensed copies from authorized publishers or rights holders.
Your responsibilities
Engineering decisions remain yours (or your organization’s). Use critical judgment and comply with applicable laws, contracts, and employer policies.
Updates
Structured data may change without notice; verify against authoritative sources before relying on it for regulated work.
Structured data products (paid download pilot)
Sellable digital assets are listed in the Digital assets catalog (currently audited CommoditySpec read models; more assets may be added over time). Each product has a detail page at `/metadata/products/{slug}`. This is separate from free calculators and voluntary tips.
- Public browse: Visitors may view the catalog, price labels, publish status, and preview links without signing in.
- Public preview: Dedicated explorer pages offer limited-row preview/sample export where available; otherwise see the standards coverage map.
- Full bundles: Require sign-in and a one-time purchase of that specific product; the same account may re-download that purchased bundle unless terms say otherwise. Buying one product does not unlock other catalog items.
- China / no Ko-fi: Signed-in users may submit WeChat/Alipay/Ko-fi transaction proof on the product page for manual verification. This is a product purchase, not the site tip QR code. Email `hello@miloengai.com` for payee instructions.
- Your duty: Obtain licensed full texts and verify all engineering use.
- Internal corpus: OCR/Markdown review materials are not sold; customer-facing delivery is published structured read models only.
Payment channels and activation times
| Channel | How | Activation | |---------|-----|------------| | PayPal (button above form) | REST Checkout; auto capture after return to `/metadata` | Usually instant (seconds–minutes) | | Ko-fi | Pay on Ko-fi → submit order ID on this site | Manual review, 1–2 business days | | WeChat / Alipay | Email for payee details → transfer → submit transaction ID | Manual review, 1–2 business days | | PayPal proof fallback | Only if PayPal above charged but download still locked | Manual fallback, 1–2 business days |
Notes:
- Each purchase unlocks one catalog product only; tips/donations do not substitute for a product purchase.
- PayPal auto-unlock requires: `PAYPAL_CLIENT_ID` / `PAYPAL_CLIENT_SECRET` (set `PAYPAL_MODE=live` for Live), a parseable USD amount in `price_label` (e.g. `$58`), `NEXT_PUBLIC_SITE_URL` matching the PayPal return domain, and the same signed-in account on this site.
- If PayPal paid but not unlocked: refresh `/metadata` or User dashboard → Digital assets; if still locked, submit proof under PayPal (not auto-unlocked) or email `hello@miloengai.com`.
Purchase terms are also described in the Terms of Service.