A flat structured dictionary like the following

let dic:[String: String] = [
    "auth/type":"saml2.web.post",
    "auth/config/saml2.web.post.authchallengeheader.name":"com.backend.example.cloud.security.login",
    "auth/config/saml2.web.post.finish.endpoint.redirectparam":"finishEndpointParam",
    "auth/config/saml2.web.post.finish.endpoint.uri":"/SAMLAuthLauncher",
    "host":"example.backend.com",
    "protocol":"https"
]

can describe a multi-level data structure in which the different levels are separated by / in the key

Each level is an array of dictionaries and for convenience reasons the index is omitted in the notation. Hence auth/type is actually representing auth[0]["type"]

To inflate the dictionary and re-construct the multi-level data structure can be achieved by using the inflate function which is available as Dictionary extension

let result = dic.inflate()

For the example above you will receive the following result

result: [String: Any] = [
    "host":"example.backend.com",
    "protocol":"https",
    "auth": [
        ["type": "saml2.web.post",
         "config":
            [
                [
                    "saml2.web.post.authchallengeheader.name": "com.backend.example.cloud.security.login",
                    "saml2.web.post.finish.endpoint.redirectparam" : "finishEndpointParam",
                    "saml2.web.post.finish.endpoint.uri": "/SAMLAuthLauncher"
                ]
            ]
        ]
    ]
]

• Index Notation is not (yet) supported

   let dic:[String: String] = [
   	"auth/type":"saml2.web.post",
   	"auth/config[0]/saml2.web.post.authchallengeheader.name":"com.backend.example.cloud.security.login",
   	"auth/config[0]/saml2.web.post.finish.endpoint.redirectparam":"finishEndpointParam",
   	"auth/config[0]/saml2.web.post.finish.endpoint.uri":"/SAMLAuthLauncher",
   	"host":"example.backend.com",
   	"protocol":"https"
   ]
   let result = dic.inflate() // will behave unexpectedly