[Html Provider] Use schema.org attributes if present on a page to generate an API, in addition to the .Tables member

[ovatsus]

http://en.wikipedia.org/wiki/Schema.org

I did a small experiment on the zoopla.co.uk listings, and it gave a nice generated API with all the interesting attributes of each property

[ovatsus]

eBay, IMDB, and Rotten Tomatos also use it

[ovatsus]

This should be relatively easy to do, see this function: https://github.com/ovatsus/HouseHunter2/blob/5fee47f412f62f4d53bcd901f82adae18a93ac5b/Utils.fs#L192

[dsyme]

/repo-assist please implement this

[github-actions]

🤖 This is an automated response from Repo Assist.

I've implemented schema.org microdata support for HtmlProvider! A draft PR has been opened (see below). Here's how it works:

Given HTML like:

(div itemscope itemtype="(schema.org/redacted)
  <span itemprop="name">Jane Smith</span>
  <span itemprop="jobTitle">Software Engineer</span>
  (a itemprop="url" href="(example.com/redacted)")Homepage(/a)
(/div)
(div itemscope itemtype="(schema.org/redacted)
  <span itemprop="name">Bob Jones</span>
  <span itemprop="jobTitle">Designer</span>
(/div)

The provider generates a typed Schemas container:

type MyPage = HtmlProvider<"page.html">

let doc = MyPage.Load("page.html")

// doc.Schemas.Person is a typed array of Person items
for person in doc.Schemas.Person do
    printfn "%s — %s" person.Name person.JobTitle
    // person.Url (from (a itemprop="url" href="..."))

Features:

• Automatic detection of itemscope/itemtype/itemprop attributes
• Items grouped by schema type URL (e.g. (schema.org/redacted) → Schemas.Person`)
• Property values follow the HTML microdata spec: uses content attribute for (meta), href for (a)/(link), src for (img)/(video), datetime for (time), or inner text otherwise
• Nested itemscope elements are not traversed (per spec)
• All itemprop names found across items are union-merged into the type

PR: #1676

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