fix test and update changelog about schema.org content type change #1…

…0542

The test file is used in InfoIT#testGetExportFormats

doc/release-notes/10542-signposting.md

@@ -6,4 +6,6 @@ The output of HEAD, GET, and the Signposting "linkset" API have all been updated
 
 This provides a lightweight machine-readable way to first retrieve a list of links (via a HTTP HEAD request, for example) to each available metadata export format and then follow up with a request for the export format of interest.
 
+In addition, the content type for the `schema.org` dataset metadata export format has been corrected. It was `application/json` and now it is `application/ld+json`.
+
 See also [the docs](https://preview.guides.gdcc.io/en/develop/api/native-api.html#retrieve-signposting-information) and #10542.

doc/sphinx-guides/source/api/changelog.rst

@@ -7,6 +7,10 @@ This API changelog is experimental and we would love feedback on its usefulness.
     :local:
     :depth: 1
 
+v6.5
+----
+- The content type for the ``schema.org`` dataset metadata export format has been corrected. It was ``application/json`` and now it is ``application/ld+json``. See also :ref:`export-dataset-metadata-api`.
+
 v6.4
 ----
 

src/test/resources/json/export-formats.json

@@ -36,7 +36,7 @@
     },
     "schema.org": {
       "displayName": "Schema.org JSON-LD",
-      "mediaType": "application/json",
+      "mediaType": "application/ld+json",
       "isHarvestable": false,
       "isVisibleInUserInterface": true
     },