Update README.adoc

README.adoc

@@ -4,8 +4,8 @@ Collection of material relating to schema languages, their selection and use
 === Internet2 Trust and Identity Schema
 
 :Email:     hazelton@internet2.edu
-:Date:      2020-06-06
-:Revision:  04
+:Date:      2020-09-02
+:Revision:  05
 :SelfLink:  https://github.internet2.edu/api-schema/onSchemaLanguages
 :Editor:    Keith Hazelton
 :Email:     hazelton@internet2.edu
@@ -17,6 +17,14 @@ Self-link: {SelfLink} +
 Editor: {Editor}, {Email}
 ====
 
+- - -
+_2020-09-02 12:46 JSON, YAML, XML, APIs linters, converters, and document validators_
+
+https://codebeautify.org/jsonvalidator <= multi-tool, well done +
+https://editor.swagger.io/ +
+https://app.swaggerhub.com +
+https://www.asyncapi.com/ <= See Tooling tab +
+
 - - -
 ==== Person schema
 _2020-06-03 15:06_