了解 JSON Schema 草稿版本 4 中的additionalProperties关键字

You have found an error in the spec, so your not actually misinterpreting something.

There is an updated version (from two days later) of the internet draft on the IETF website, where this example is different.

see: https://datatracker.ietf.org/doc/html/draft-fge-json-schema-validation-00#page-13

由于该文件是一份互联网草稿，http://datatracker.ietf.org/上的版本很可能是正确的版本.

Status of This Memo

This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.

Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.

Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF).

此外，这两个版本有不同的日期和有效期:

• version you link - written: January 30, 2013 and Expires: August 3, 2013.
• version on ietf - written on: February 1, 2013 and Expires: August 5, 2013

On the IETF version:

This schema will be used as an example:

   {
       "properties": {
           "p1": {}
       },
       "patternProperties": {
           "p": {},
           "[0-9]": {}
       },
       "additionalProperties": false

This is the instance to validate:

{

The three property sets are:

   s  [ "p1", "p2", "a32&o", "", "fiddle", "apple" ]

   p  [ "p1" ]

   pp [ "p", "[0-9]" ]

应用算法的两个步骤:

      after the first step, "p1" is removed from "s";

      after the second step, "p2" (matched by "p"), "a32&o" (matched by
      "[0-9]") and "apple" (matched by "p") are removed from "s".

集合"%s"仍然包含两个元素""和"小提琴".验证 因此失败了.