According to the WMF Core Platform Team's REST API Design principles, inherited by the the Wikibase REST API proposal, multi-word properties in json repsonses should be written in Snake-case, i.e. this_property not thisProperty.

The following key names from the WikibaseManifest prototype must therefore be changed.

In ManifestGenerator.php:

• rootScriptUrl --> root_script_url
• equivEntities --> equiv_entities
• localRdfNamespaces --> local_rdf_namespaces
• externalServices --> external_services
• entities --> entity_sources (according to T262807)

In EntityNamespaces.php:

• namespaceId --> namespace_id
• namespaceString --> namespace_string

In ExternalServices.php:

• queryservice_ui --> queryservice_ui
• openrefine-reconcile --> openrefine_reconcile