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https://issues.apache.org/jira/browse/LOG4J2-623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13995225#comment-13995225
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Gary Gregory commented on LOG4J2-623:
-------------------------------------

Simple: If it is not this way, it is *not* possible to define and use an XML 
Schema (or JSON Schema) to validate XML (or JSON) events. 

If you use the key values as the tag names, then each different kind of context 
map will requires a special schema for those kinds of event. I am not 
considering defining "anything can go in a context map" a useful schema 
fragment definition.

> Better structure of Thread Context Map in JSONLayout
> ----------------------------------------------------
>
>                 Key: LOG4J2-623
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-623
>             Project: Log4j 2
>          Issue Type: Improvement
>          Components: Layouts
>    Affects Versions: 2.0-rc1
>            Reporter: Mikael Ståldal
>            Assignee: Ralph Goers
>            Priority: Minor
>             Fix For: 2.0-rc2
>
>
> Currently, the Thread Context Map looks like this in JSONLayout:
> {code:JavaScript|title=Current}
>  "Properties":[
>       {
>         "name":"UserName",
>         "value":"admin"
>       },
>       {
>         "name":"OrgName",
>         "value":"test"
>       } 
>     ] 
> {code}
> This does not properly make use of the JSON data format. Since the Thread 
> Context Map is a map, it should be represented as a JSON object. And why not 
> name it "mdc" rather than the quite vauge "Properties"?
> {code:JavaScript|title=Suggested}
>   "mdc": {
>     "UserName":"admin", 
>     "OrgName":"test"
>   }
> {code}



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