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8 changes: 5 additions & 3 deletions jsonschema-core.md
Original file line number Diff line number Diff line change
Expand Up @@ -424,11 +424,13 @@ Implementations MAY provide the ability to register or load handlers for
vocabularies that they do not support directly. The exact mechanism for
registering and implementing such handlers is implementation-dependent.

#### Explicit annotation keywords {#explicit-annotations}
#### Implicit annotation keywords {#implicit-annotations}

The values of keywords which begin with "x-" MUST be collected as annotations.
Keywords which begin with "x-" are implicitly defined as annotation keywords.

Keywords which begin with "x-" symbol MUST NOT affect evaluation of a schema in
The values of such keywords MUST be collected as annotations.

Implicit annotation keywords MUST NOT affect evaluation of a schema in
any way other than annotation collection.

Consequently, the "x-" prefix is reserved for this purpose, and extension
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