support HTTP Accept-Language in the request for Credential Issuer Met…

…adata to request a subset for display data

openid-4-verifiable-credential-issuance-1_0.md

@@ -1160,6 +1160,8 @@ If the Credential Issuer is unable to perform discovery of the Wallet's Credenti
 
 ## Credential Issuer Metadata {#credential-issuer-metadata}
 
+The Credential Issuer Metadata contains information on the Credential Issuer's techical capabilities, supported credentials and (internationalized) display information.
+
 ### Credential Issuer Identifier {#credential-issuer-identifier}
 
 A Credential Issuer is identified by a case sensitive URL using the `https` scheme that contains scheme, host and, optionally, port number and path components, but no query or fragment components. 
@@ -1168,9 +1170,19 @@ A Credential Issuer is identified by a case sensitive URL using the `https` sche
 
 The Credential Issuer's configuration can be retrieved using the Credential Issuer Identifier.
 
-Credential Issuers publishing metadata MUST make a JSON document available at the path formed by concatenating the string `/.well-known/openid-credential-issuer` to the Credential Issuer Identifier. If the Credential Issuer value contains a path component, any terminating `/` MUST be removed before appending `/.well-known/openid-credential-issuer`. 
+Credential Issuers publishing metadata MUST make a JSON document available at the path formed by concatenating the string `/.well-known/openid-credential-issuer` to the Credential Issuer Identifier. If the Credential Issuer value contains a path component, any terminating `/` MUST be removed before appending `/.well-known/openid-credential-issuer`.
+
+To fetch the Credential Issuer Metadata, a requester MUST send a HTTP GET to the path formed following the steps above utilizing TLS. The Credential Issuer MUST return a JSON document compliant with this specification using the `application/json` media type and a HTTP Status Code 200.
+
+The Wallet is RECOMMENDED to send an Accept-Language Header in the HTTP GET request to indicate the particular languages he is interested in. The Credential Issuer is RECOMMENDED to send a subset of internationalized display data containing the requested languages and using the HTTP Content-Language Header. The Credential Issuer MAY ignore the Accept-Language Header and send all supported languages or a any chosen default subset.
+
+Below is a non-normative example of a Batch Credential Request:
 
-The path formed following the steps above MUST point to a JSON document compliant with this specification. The document MUST be returned using the `application/json` media type.
+```
+GET /.well-known/openid-credential-issuer HTTP/1.1
+Host: server.example.com
+Accept-Language: de-DE
+```
 
 ### Credential Issuer Metadata Parameters {#credential-issuer-parameters}