lab4.md

@@ -52,7 +52,8 @@ This will insert two objects, the first has uuid `id1`, coordinate `(8,10)` and
 The following query can be used to retrieve all the elements in the database:
 
 ```bash
-ros2 service call /kdb_server/sparql_query ros2_kdb_interfaces/srv/QueryDatabase "graphname: 'salientpoints'
+ros2 service call /kdb_server/sparql_query ros2_kdb_interfaces/srv/QueryDatabase "queries:
+  - graphnames: [salientpoints]
     format: 'json'
     query: 'SELECT ?subject ?predicate ?object WHERE { ?subject ?predicate ?object }'"
 ```
@@ -63,7 +64,8 @@ query: 'SELECT ?subject ?predicate ?object WHERE { ?subject ?predicate ?object }
 The following query can be used to retrieve all the object with their class that are near the point of coordinate `(10, 12)`:
 
 ```bash
-ros2 service call /kdb_server/sparql_query ros2_kdb_interfaces/srv/QueryDatabase "graphname: 'salientpoints'
+ros2 service call /kdb_server/sparql_query ros2_kdb_interfaces/srv/QueryDatabase "queries:
+ - graphnames: ['salientpoints']
    format: 'json'
    query: '
 PREFIX gis: <http://www.ida.liu.se/~TDDE05/gis>