RFR: JDK-8296547: Add @spec tags to API

[Weijun Wang]

On Thu, 10 Nov 2022 01:10:13 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

> Please review a "somewhat automated" change to insert `@spec` tags into doc comments, as appropriate, to leverage the recent new javadoc feature to generate a new page listing the references to all external specifications listed in the `@spec` tags.
> 
> "Somewhat automated" means that I wrote and used a temporary utility to scan doc comments looking for HTML links to selected sites, such as `ietf.org`, `unicode.org`, `w3.org`. These links may be in the main description of a doc comment, or in `@see` tags. For each link, the URL is examined, and "normalized", and inserted into the doc comment with a new `@spec` tag, giving the link and tile for the spec.
> 
> "Normalized" means...
> * Use `https:` where possible (includes pretty much all cases)
> * Use a single consistent host name for all URLs coming from the same spec site (i.e. don't use different aliases for the same site)
> * Point to the root page of a multi-page spec
> * Use a consistent form of the spec, preferring HTML over plain text where both are available (this mostly applies to IETF specs)
> 
> In addition, a "standard" title is determined for all specs,  determined either from the content of the (main) spec page or from site index pages.
> 
> The net effect is (or should be) that **all** the changes are to just **add** new `@spec` tags, based on the links found in each doc comment. There should be no other changes to the doc comments, or to the implementation of any classes and interfaces.
> 
> That being said, the utility I wrote does have additional abilities, to update the links that it finds (e.g. changing to use `https:` etc,) but those features are _not_ being used here, but could be used in followup PRs if component teams so desired. I did notice while working on this overall feature that many of our links do point to "outdated" pages, some with eye-catching notices declaring that the spec has been superseded. Determining how, when and where to update such links is beyond the scope of this PR.
> 
> Going forward, it is to be hoped that component teams will maintain the underlying links, and the URLs in `@spec` tags, such that if references to external specifications are updated, this will include updating the `@spec` tags.
> 
> To see the effect of all these new `@spec` tags, see http://cr.openjdk.java.net/~jjg/8296546/api.00/
> 
> In particular, see the new [External Specifications](http://cr.openjdk.java.net/~jjg/8296546/api.00/external-specs.html) page, which you can also find via the new link near the top of the [Index](http://cr.openjdk.java.net/~jjg/8296546/api.00/index-files/index-1.html) pages.

I see https://www.ietf.org/rfc/rfc0822.html. Should be https://www.ietf.org/rfc/rfc822.html

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PR: https://git.openjdk.org/jdk/pull/11073