diff --git a/tests/data/definitions_ingv_1.yaml b/tests/data/definitions_ingv_1.yaml
new file mode 100644
index 0000000..11ad02b
--- /dev/null
+++ b/tests/data/definitions_ingv_1.yaml
@@ -0,0 +1,866 @@
+x-commons:
+  ratelimit-headers: &ratelimit-headers
+    X-RateLimit-Limit:
+      $ref: '#/components/headers/X-RateLimit-Limit'
+    X-RateLimit-Remaining:
+      $ref: '#/components/headers/X-RateLimit-Remaining'
+    X-RateLimit-Reset:
+      $ref: '#/components/headers/X-RateLimit-Reset'
+  common-responses: &common-responses
+    '400':
+      $ref: '#/components/responses/400BadRequest'      
+    '422':
+      $ref: '#/components/responses/422UnprocessableEntity'
+    '429':
+      $ref: '#/components/responses/429TooManyRequests'
+    '503':
+      $ref: '#/components/responses/503ServiceUnavailable'
+    '500':
+      $ref: '#/components/responses/500InternalServerError'
+    default:
+      $ref: '#/components/responses/default'
+
+openapi: 3.0.3
+info:
+  termsOfService: http://terremoti.ingv.it/webservices_and_software
+  contact:
+    email: valentino.lauciani@ingv.it
+    name: INGV - Valentino Lauciani
+    url: http://terremoti.ingv.it/webservices_and_software
+  description: "
+    \ \n\n \
+    \ # Introduction\n \
+    \ Dante is an API Web Service used for iteract with earthquake data stored in database (**quakedb**); the **quakedb** database schema is used at INGV.\n \
+    \ Use other schema would require cration of specific `Model` and `Controller` but this is the potential of web services. \
+    \ \n\n \
+    \ Dante provides a set of routes to store message **event**, **origin**, **magnitude**, **arrival**, **...**.
+    \ \n\n \
+    \ # Input\n \
+    \ As input, Dante acept:\n 
+    \ - A `json` message (view '**store**' spec below) \n \
+    \ - An Eartworm `json` message (view '**earthworm api**' spec below) produced by **ew2openapi** module \
+    \ \n\n \
+    \ # Output\n \
+    \ As output, Dante has a RESTful api foreach database table and implement three specific routes: \n 
+    \ - `events_pref`: returns the preferred origin and the preferred magnitude from all clusterd events. \n \
+    \ - `events`: returns the preferred origin and the preferred magnitude from the same instance. \n \
+    \ - `event`: returns the full event (event, origins, magnitudes, arrivals, amplitude, etc...) from an **eventid** or **originid**/**originid**. \n \
+    \ \n\n \
+    \ "
+  license:
+    name: Creative Commons Attribution 4.0 International
+    url: http://creativecommons.org/licenses/by/4.0/
+  title: Dante Web Services
+  version: 2.25.0-dev
+  x-api-id: 24e1e2e6-43ad-4a84-bec7-5c6ddcf5db97
+  x-logo: http://webservices.ingv.it/ingv_logo_text_two_lines.png
+  x-summary: Web Service to receive location from Earthworm or JSON standard
+  x-sandbox: true
+tags:
+  - name: user
+    description: "Operations about user"
+  - name: get
+    description: "Get data"
+  - name: store
+    description: "Store data"
+  - name: update
+    description: "Update data"
+  - name: earthworm api
+    description: "Earthworm API to store data"
+servers:
+- url: http://caravel.int.ingv.it/api/quakedb
+  description: production
+  # 'x-sandbox' is needed to use 'http' instead of 'https'
+  x-sandbox: true 
+- url: http://{hostname}/api/quakedb
+  description: development
+  # 'x-sandbox' is needed to use 'http' instead of 'https'
+  x-sandbox: true 
+  variables:
+    hostname:
+      enum:
+        - 'localhost:8087'
+        - 'caravel.int.ingv.it:8585'
+      default: 'localhost'
+ 
+paths:
+  /v1/event:
+    get:
+      description: This API returns the preferred origin and the preferred magnitude from all clusterd events.
+      summary: This API returns the preferred origin and the preferred magnitude from all clusterd events.
+      operationId: getEvent
+      parameters:
+        - $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/parameters/originid'
+        - $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/parameters/eventid'
+        - $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/parameters/level'
+      responses:
+        <<: *common-responses
+        '200':
+          $ref: '#/components/responses/200Event'
+      tags:
+      - get
+components:
+  headers:
+    Cache-Control:
+      schema:
+        type: string
+    Retry-After:
+      $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/headers/Retry-After'
+    X-RateLimit-Limit:
+      $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/headers/X-RateLimit-Limit'
+    X-RateLimit-Reset:
+      $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/headers/X-RateLimit-Reset'
+    X-RateLimit-Remaining:
+      $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/headers/X-RateLimit-Remaining'
+  responses:
+    204NoContent:
+      $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/responses/204NoContent'
+    400BadRequest:
+      $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/responses/400BadRequest'
+    401Unauthorized:
+      $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/responses/401Unauthorized'
+    403Forbidden:
+      $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/responses/403Forbidden'      
+    404NotFound:
+      $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/responses/404NotFound'
+    422UnprocessableEntity:
+      $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/responses/422UnprocessableEntity'      
+    429TooManyRequests:
+      $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/responses/429TooManyRequests'
+    500InternalServerError:
+      $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/responses/500InternalServerError'
+    503ServiceUnavailable:
+      $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/responses/503ServiceUnavailable'
+    default:
+      $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/responses/default'
+    200Event:
+        description: Operation successful
+        headers:
+          <<: *ratelimit-headers
+        content:
+            application/json:
+                schema:
+                    properties:
+                        data:
+                            properties:
+                                event:
+                                    $ref: '#/components/schemas/ObjectEventGet'
+    200EventsAndEventsPref:
+        description: Operation successful
+        headers:
+          <<: *ratelimit-headers        
+        content:
+            application/json:
+                schema:
+                  type: object
+                  properties:
+                    links:
+                      $ref: '#/components/schemas/linksDefinition'
+                    meta:
+                      $ref: '#/components/schemas/metaDefinition'                            
+                    data:
+                      type: array
+                      items:
+                        $ref: '#/components/schemas/ObjectEventsAndEventsPref'
+  schemas:
+    ObjectProvenance:
+      type: object
+      required:
+        - softwarename
+        - version      
+      properties:
+        name:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/provenance__name'
+        softwarename:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/provenance__softwarename'
+        version:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/provenance__version'
+        model:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/provenance__model'
+        method:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/provenance__method'
+        parameters:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/provenance__parameters'
+        program:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/provenance__program'              
+        username:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/provenance__username'
+        hostname:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/provenance__hostname'
+        description:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/description'
+    ############################################################
+    ObjectEventsAndEventsPref:
+      type: object
+      properties:
+        id:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/id'
+        id_localspace:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/id_localspace'
+        localspace:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/localspace__name'
+        event_group_id:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/event__fk_event_group'              
+        preferred_origin_id:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/event__fk_origin_preferred'
+        preferred_magnitude_id:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/event__fk_magnitude_preferred'
+        preferred_focalmechanism_id:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/event__fk_focalmechanism_preferred'
+        type_group:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/event__type_group'
+        type_event:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/type_event__name'
+        modified:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/modified'
+        inserted:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/inserted'        
+        origin:
+          $ref: '#/components/schemas/ObjectOriginForEventsAndEventsPref'
+        magnitude:
+          $ref: '#/components/schemas/ObjectMagnitudeForEventsAndEventsPref'              
+        provenance:
+          $ref: '#/components/schemas/ObjectProvenaceForEventsAndEventsPref'              
+    ############################################################
+    ObjectLocalspace:
+      type: object
+      required:
+        - name
+      properties:
+        name:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/localspace__name'
+        description:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/description'
+    ############################################################
+    ObjectIdModifiedInserted:
+      properties:
+        id:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/id'
+        modified:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/modified'
+        inserted:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/inserted'
+    ############################################################
+    ObjectScnl:
+      properties:
+          net:
+            $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/scnl__net'
+          sta:
+            $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/scnl__sta'
+          cha:
+            $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/scnl__cha'
+          loc:
+            $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/scnl__loc'
+    ############################################################
+    ObjectTypeAmplitude:
+      properties:
+        name:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/type_amplitude__name'
+        unit:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/type_amplitude__unit'
+    ############################################################
+    ObjectPickEw:
+      type: object
+      required:
+        - pamp1
+      properties:
+        pamp1:
+            $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/pickew__pamp'
+        pamp2:
+            $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/pickew__pamp'
+        pamp3:
+            $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/pickew__pamp'
+    ############################################################
+    ObjectEvent:
+      type: object
+      discriminator: 
+        propertyName: ObjectEventGet
+      properties:
+        id_localspace:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/id_localspace'
+        type_event:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/type_event__name'
+        event_group_id:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/event__fk_event_group'
+        preferred_origin_id:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/event__fk_origin_preferred'
+        preferred_magnitude_id:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/event__fk_magnitude_preferred'
+        preferred_focalmechanism_id:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/event__fk_focalmechanism_preferred'
+        type_group:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/event__type_group'
+    ObjectEventGet:
+      allOf:
+      - $ref: '#/components/schemas/ObjectEvent'
+      - $ref: '#/components/schemas/ObjectIdModifiedInserted'
+      - type: object
+        properties:
+          provenance:
+            $ref: '#/components/schemas/ObjectProvenance'
+          localspace:
+            $ref: '#/components/schemas/ObjectLocalspace'
+          origins:
+            type: array
+            items:
+              $ref: '#/components/schemas/ObjectOriginGet'
+          strongmotions:
+            type: array
+            items:
+              $ref: '#/components/schemas/ObjectStrongmotionGet'
+    ############################################################
+    ObjectOrigin:
+      type: object
+      discriminator: 
+        propertyName: ObjectOriginGet 
+      properties:
+        id_localspace:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/id_localspace'
+        azim_gap:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__azim_gap'
+        confidence_level:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/confidence_level'
+        depth:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/depth'
+        e0:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__e0'
+        e0_az:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__e0_az'
+        e0_dip:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__e0_dip'
+        e1:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__e1'
+        e1_az:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__e1_az'
+        e1_dip:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__e1_dip'
+        e2:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__e2'
+        e2_az:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__e2_az'
+        e2_dip:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__e2_dip'
+        err_depth:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__err_depth'
+        err_h:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__err_h'
+        err_lat:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__err_lat'
+        err_lon:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__err_lon'
+        err_ot:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__err_ot'
+        err_z:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__err_z'
+        fix_depth:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__fix_depth'
+        is_centroid:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__is_centroid'
+        lat:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/latitude'
+        lon:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/longitude'
+        max_distance:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__max_distance'
+        med_distance:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__med_distance'
+        min_distance:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__min_distance'
+        nph:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__nph'
+        nph_fm:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__nph_fm'
+        nph_s:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__nph_s'
+        nph_tot:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__nph_tot'
+        ot:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__ot'
+        quality:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__quality'
+        quality_numeric:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__quality_numeric'
+        region:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin_region_name__region'
+        rms:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__rms'
+        sec_azim_gap:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__sec_azim_gap'
+        w_rms:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__w_rms'
+        type_origin:
+          properties:
+            name:
+              $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/type_origin__name'
+            value:
+              $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/type_origin__value'
+    ObjectOriginGet:
+      allOf:
+      - $ref: '#/components/schemas/ObjectOrigin'
+      - $ref: '#/components/schemas/ObjectIdModifiedInserted'
+      - type: object
+        properties:
+          localspace:
+            $ref: '#/components/schemas/ObjectLocalspace'
+          provenance:
+            $ref: '#/components/schemas/ObjectProvenance'
+          magnitudes:
+            type: array
+            items:
+              $ref: '#/components/schemas/ObjectMagnitudeGet'
+          arrivals:
+            type: array
+            items:
+              $ref: '#/components/schemas/ObjectArrivalGet'
+          focalmechanisms:
+            type: array
+            items:
+              $ref: '#/components/schemas/ObjectFocalmechanismGet'
+    ############################################################
+    ObjectMagnitude:
+      type: object
+      discriminator: 
+        propertyName: ObjectMagnitudeGet      
+      properties:
+        id_localspace:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/id_localspace'
+        mag:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/magnitude__mag'
+        lower_uncertainty:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/magnitude__lower_uncertainty'
+        upper_uncertainty:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/magnitude__upper_uncertainty'
+        confidence_level:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/confidence_level'
+        quality:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/magnitude__quality'
+        min_dist:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/magnitude__min_dist'
+        azimut:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/magnitude__azimut'
+        nsta:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/magnitude__nsta'
+        ncha:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/magnitude__ncha'
+        nsta_used:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/magnitude__nsta_used'
+        ncha_used:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/magnitude__ncha_used'
+        mag_quality:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/magnitude__mag_quality'
+        type_magnitude:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/type_magnitude__name'
+    ObjectMagnitudeGet:
+      allOf:
+      - $ref: '#/components/schemas/ObjectMagnitude'
+      - $ref: '#/components/schemas/ObjectIdModifiedInserted'
+      - properties:
+          localspace:
+            $ref: '#/components/schemas/ObjectLocalspace'
+          provenance:
+            $ref: '#/components/schemas/ObjectProvenance'
+          stationmagnitudes:
+            type: array
+            items:
+              $ref: '#/components/schemas/ObjectStationmagnitudeGet'
+        type: object        
+    ############################################################
+    ObjectFocalmechanism:
+      properties:
+        id_localspace:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/id_localspace'
+        strike1:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/focalmechanism__strike1'
+        dip1:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/focalmechanism__dip1'
+        rake1:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/focalmechanism__rake1'
+        strike2:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/focalmechanism__strike2'
+        dip2:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/focalmechanism__dip2'
+        rake2:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/focalmechanism__rake2'
+        azim_gap:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/focalmechanism__azim_gap'
+        nsta_polarity:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/focalmechanism__nsta_polarity'
+        misfit:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/focalmechanism__misfit'
+        stdr:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/focalmechanism__stdr'
+        rms_ang_diff_acc_pref:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/focalmechanism__rms_ang_diff_acc_pref'
+        frac_acc_30deg_pref:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/focalmechanism__frac_acc_30deg_pref'
+        quality:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/focalmechanism__quality'
+        url:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/focalmechanism__url'
+    ObjectFocalmechanismGet:
+      allOf:
+      - $ref: '#/components/schemas/ObjectIdModifiedInserted'
+      - $ref: '#/components/schemas/ObjectFocalmechanism'
+      - $ref: '#/components/schemas/ObjectMomenttensorGet'
+      - properties:
+          localspace:
+            $ref: '#/components/schemas/ObjectLocalspace'
+          provenance:
+            $ref: '#/components/schemas/ObjectProvenance'
+    ############################################################
+    ObjectMomenttensor:
+      allOf:
+      - type: object
+      - properties:
+          id_localspace:
+            $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/id_localspace'
+          originid:
+            $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/id'
+          magnitudeid:
+            $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/id'
+          scalarmoment:
+            $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/momenttensor__scalarmoment'
+          mrr:
+            $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/momenttensor__mrr'
+          mtt:
+            $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/momenttensor__mtt'
+          mpp:
+            $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/momenttensor__mpp'
+          mrt:
+            $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/momenttensor__mrt'
+          mrp:
+            $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/momenttensor__mrp'
+          mtp:
+            $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/momenttensor__mtp'
+          clvd:
+            $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/momenttensor__clvd'
+          iso:
+            $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/momenttensor__iso'
+          variance_reduction:
+            $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/momenttensor__variance_reduction'
+          double_couple:
+            $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/momenttensor__double_couple'
+          type_momenttensor:
+            $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/type_momenttensor__name'
+    ObjectMomenttensorGet:
+      properties:
+        momenttensor:
+          allOf:
+            - $ref: '#/components/schemas/ObjectIdModifiedInserted'
+            - $ref: '#/components/schemas/ObjectMomenttensor'
+            - properties:
+                localspace:
+                  $ref: '#/components/schemas/ObjectLocalspace'
+                provenance:
+                  $ref: '#/components/schemas/ObjectProvenance'
+    ############################################################
+    ObjectStrongmotion:
+      allOf:
+        - $ref: '#/components/schemas/ObjectScnl'
+        - properties:
+            id_localspace:
+              $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/id_localspace'
+            t_dt:
+              $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/strongmotion__t_dt'
+            pga:
+              $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/strongmotion__pga'
+            tpga_dt:
+              $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/strongmotion__tpga_dt'
+            pgv:
+              $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/strongmotion__pgv'
+            tpgv_dt:
+              $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/strongmotion__tpgv_dt'
+            pgd:
+              $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/strongmotion__pgd'
+            tpgd_dt:
+              $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/strongmotion__tpgd_dt'
+            rsa_030:
+              $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/strongmotion__rsa_030'
+            rsa_100:
+              $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/strongmotion__rsa_100'
+            rsa_300:
+              $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/strongmotion__rsa_300'
+    ObjectStrongmotionGet:
+      allOf:
+      - $ref: '#/components/schemas/ObjectIdModifiedInserted'
+      - $ref: '#/components/schemas/ObjectStrongmotion'
+      - $ref: '#/components/schemas/ObjectStrongmotionAltGet'
+      - $ref: '#/components/schemas/ObjectStrongmotionRsaGet'        
+      - properties:
+          localspace:
+            $ref: '#/components/schemas/ObjectLocalspace'
+          provenance:
+            $ref: '#/components/schemas/ObjectProvenance'
+    ############################################################
+    ObjectStrongmotionAlt:
+      properties:
+        time:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/strongmotion_alt__t_alt_dt'
+        code:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/strongmotion_alt__altcode'
+    ObjectStrongmotionAltGet:
+      properties:
+        alternative:
+          allOf:
+            - $ref: '#/components/schemas/ObjectStrongmotionAlt'
+    ############################################################
+    ObjectStrongmotionRsa:
+      properties:
+        value:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/strongmotion_rsa__value'
+        period:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/strongmotion_rsa__period'
+    ObjectStrongmotionRsaGet:
+      properties:
+        rsa:
+          items:
+            allOf:
+            - $ref: '#/components/schemas/ObjectStrongmotionRsa'
+          type: array
+    ############################################################
+    ObjectStationmagnitude:
+      allOf:
+        - $ref: '#/components/schemas/ObjectScnl'
+        - properties:
+            id_localspace:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/id_localspace'
+            pick_id:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/id'
+            time1:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/amplitude__time1'
+            amp1:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/amplitude__amp1'
+            period:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/amplitude__period'
+            time2:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/amplitude__time2'
+            amp2:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/amplitude__amp2'
+            revised:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/amplitude__revised'
+            type_amplitude:
+                $ref: '#/components/schemas/ObjectTypeAmplitude'
+            ep_distance:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/ep_distance_km'
+            orig_distance:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/arrival-stationmagnitude-st_dur_mag__orig_distance'
+            azimut:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/arrival-stationmagnitude-st_dur_mag__azimut'
+            mag:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/stationmagnitude__mag'
+            err_mag:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/stationmagnitude-st_dur_mag__err_mag'
+            mag_correction:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/stationmagnitude__mag_correction'
+            is_used:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/stationmagnitude-st_dur_mag__polarity_is_used'
+            type_magnitude:
+              $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/type_magnitude__name'
+    ObjectStationmagnitudeGet:
+      allOf:
+      - $ref: '#/components/schemas/ObjectStationmagnitude'
+      - $ref: '#/components/schemas/ObjectIdModifiedInserted'
+      - properties:
+          localspace:
+            $ref: '#/components/schemas/ObjectLocalspace'
+          provenance:
+            $ref: '#/components/schemas/ObjectProvenance'
+    ############################################################
+    ObjectArrival:
+      allOf:
+        - $ref: '#/components/schemas/ObjectScnl'
+        - properties:
+            id_localspace:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/id_localspace'
+            isc_code:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/arrival__isc_code'
+            quality_class:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/pick__pick_quality_class'
+            lower_uncertainty:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/pick__lower_uncertainty'
+            upper_uncertainty:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/pick__upper_uncertainty'
+            confidence_level:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/confidence_level'                
+            arrival_time:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/pick__arrival_time'
+            firstmotion:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/pick__firstmotion'
+            emersio:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/pick__emersio'
+            ep_distance_km:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/ep_distance_km'
+            ep_distance_delta:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/ep_distance_delta'                
+            orig_distance:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/arrival-stationmagnitude-st_dur_mag__orig_distance'
+            azimut:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/arrival-stationmagnitude-st_dur_mag__azimut'
+            take_off:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/arrival__take_off'
+            polarity_is_used:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/arrival__polarity_is_used'
+            arr_time_is_used:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/arrival__arr_time_is_used'
+            residual:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/arrival__residual'
+            weight:
+                $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/arrival__weight'
+    ObjectArrivalGet:
+      allOf:
+      - $ref: '#/components/schemas/ObjectArrival'
+      - $ref: '#/components/schemas/ObjectIdModifiedInserted'
+      - properties:
+          localspace:
+            $ref: '#/components/schemas/ObjectLocalspace'
+          provenance:
+            $ref: '#/components/schemas/ObjectProvenance'
+          pick_ew:
+            $ref: '#/components/schemas/ObjectPickEw'
+
+    ############################################################
+    ObjectOriginForEventsAndEventsPref:
+      type: object
+      properties:
+        id:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/id'
+        id_localspace:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/id_localspace'
+        localspace:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/localspace__name'
+        ot:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__ot'
+        lat:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/latitude'
+        lon:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/longitude'
+        depth:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/depth'
+        err_ot:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__err_ot'
+        err_h:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__err_h'
+        err_z:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__err_z'
+        err_lat:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__err_lat'
+        err_lon:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__err_lon'
+        quality:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin__quality'
+        region:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/origin_region_name__region'
+        modified:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/modified'
+        inserted:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/inserted'
+        type_origin:
+          properties:
+            name:
+              $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/type_origin__name'
+            value:
+              $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/type_origin__value'
+        provenance:
+          $ref: '#/components/schemas/ObjectProvenaceForEventsAndEventsPref'
+    ############################################################
+    ObjectProvenaceForEventsAndEventsPref:
+      type: object
+      properties:
+        name:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/provenance__name'
+        version:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/provenance__version'
+        softwarename:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/provenance__softwarename'
+    ObjectMagnitudeForEventsAndEventsPref:
+      type: object
+      properties:
+        id:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/id'
+        id_localspace:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/id_localspace'              
+        localspace:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/localspace__name'
+        mag:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/magnitude__mag'
+        type_magnitude:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/type_magnitude__name'
+        lower_uncertainty:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/magnitude__lower_uncertainty'
+        upper_uncertainty:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/magnitude__upper_uncertainty'
+        quality:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/magnitude__quality'
+        mag_quality:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/magnitude__mag_quality'
+        originid:
+          $ref: 'https://ingv.github.io/openapi/definitions.yaml#/components/schemas/id'
+        provenance:
+          $ref: '#/components/schemas/ObjectProvenaceForEventsAndEventsPref'
+    ############################################################
+    metaDefinition:
+      type: object
+      properties:  
+        current_page:
+          type: string
+          description: Current page.
+          example: '1'
+        from:
+          type: string
+          description: Showed record from.
+          example: '1'      
+        last_page:
+          type: string
+          description: Last page.
+          example: '967'
+        links:
+          type: array
+          items:
+            properties:
+              url:
+                type: string
+                description: URL base path.
+                example: 'http://localhost:8087'            
+              label:
+                type: string
+                description: Page label.
+                example: '5'                
+              active:
+                type: string
+                example: 'false'
+        path:
+          type: string
+          description: URL base path.
+          example: 'http://localhost:8087'
+        per_page:
+          type: string
+          description: Record per page.
+          example: '4000'      
+        to:
+          type: string
+          description: Showed record to.
+          example: '4000'          
+        total:
+          type: string
+          description: Total records.
+          example: '50'
+    ############################################################
+    linksDefinition:
+      type: object
+      properties:  
+        first:
+          type: string
+          description: URL first page.
+          example: 'http://localhost:8087/api/quakedb/v1/events_pref/?page=2'
+        last:
+          type: string
+          description: URL last page.
+          example: 'http://localhost:8087/api/quakedb/v1/events_pref/?page=4'   
+        prev:
+          type: string
+          description: URL previous page.
+          example: 'http://localhost:8087/api/quakedb/v1/events_pref/?page=1'
+        next:
+          type: string
+          description: URL next page.
+          example: 'http://localhost:8087/api/quakedb/v1/events_pref/?page=3'
\ No newline at end of file
diff --git a/tests/test_cases.py b/tests/test_cases.py
index 09e6c7f..426430c 100644
--- a/tests/test_cases.py
+++ b/tests/test_cases.py
@@ -47,6 +47,19 @@ def test_yaml_reference():
     assert "description" in ref
     assert "schema" in ref
 
+def test_issue_27():
+    fpath = Path("data/definitions_ingv_1.yaml")
+    oat = yaml_load_file(str(fpath))
+    resolver = OpenapiResolver(oat, str(fpath.resolve()))
+    resolver.resolve()
+    yaml_ = resolver.dump_yaml()
+    components = defaultdict(dict, yaml_.pop("components"))
+    log.debug(yaml_dump(components))
+    assert components["schemas"]["provenance__parameters"]
+    assert (
+        components["schemas"]["ObjectProvenance"]["properties"]["parameters"]["$ref"]
+        == "#/components/schemas/provenance__parameters"
+    )
 
 def test_resolve_subreference_fix7_1():
     fpath = Path("data/subreference.yaml")