Value after colon in object is not valid in RML

[pheyvaer]

prefixes:
  ex: http://example.com/
  n1: http://n1.com/
mappings:
  person:
    sources:
      - [test.csv~csv]
    s: http://example.com/$(id)
    po:
      - p: ex:name
        o: n1:$(name)/test::hello

results in

@prefix rr: <http://www.w3.org/ns/r2rml#>.
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
@prefix fnml: <http://semweb.mmlab.be/ns/fnml#>.
@prefix fno: <http://w3id.org/function/ontology#>.
@prefix rml: <http://semweb.mmlab.be/ns/rml#>.
@prefix ql: <http://semweb.mmlab.be/ns/ql#>.
@prefix : <http://mapping.example.com/>.
@prefix ex: <http://example.com/>.
@prefix n1: <http://n1.com/>.

:map_person_0 rml:logicalSource :source_0.
:source_0 a rml:LogicalSource;
    rml:source "test.csv";
    rml:referenceFormulation ql:CSV.
:map_person_0 a rr:TriplesMap;
    rdfs:label "person".
:s_0 a rr:SubjectMap.
:map_person_0 rr:subjectMap :s_0.
:s_0 rr:template "http://example.com/{id}".
:pom_0 a rr:PredicateObjectMap.
:map_person_0 rr:predicateObjectMap :pom_0.
:pm_0 a rr:PredicateMap.
:pom_0 rr:predicateMap :pm_0.
:pm_0 rr:constant ex:name.
:pom_0 rr:objectMap :om_0.
:om_0 a rr:ObjectMap;
    rr:template "http://n1.com/{name}/test@@@@____@@@@hello";
    rr:termType rr:Literal.

while it should be

@prefix rr: <http://www.w3.org/ns/r2rml#>.
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
@prefix fnml: <http://semweb.mmlab.be/ns/fnml#>.
@prefix fno: <http://w3id.org/function/ontology#>.
@prefix rml: <http://semweb.mmlab.be/ns/rml#>.
@prefix ql: <http://semweb.mmlab.be/ns/ql#>.
@prefix : <http://mapping.example.com/>.
@prefix ex: <http://example.com/>.
@prefix n1: <http://n1.com/>.

:map_person_0 rml:logicalSource :source_0.
:source_0 a rml:LogicalSource;
    rml:source "test.csv";
    rml:referenceFormulation ql:CSV.
:map_person_0 a rr:TriplesMap;
    rdfs:label "person".
:s_0 a rr:SubjectMap.
:map_person_0 rr:subjectMap :s_0.
:s_0 rr:template "http://example.com/{id}".
:pom_0 a rr:PredicateObjectMap.
:map_person_0 rr:predicateObjectMap :pom_0.
:pm_0 a rr:PredicateMap.
:pom_0 rr:predicateMap :pm_0.
:pm_0 rr:constant ex:name.
:pom_0 rr:objectMap :om_0.
:om_0 a rr:ObjectMap;
    rr:template "http://n1.com/{name}/test:hello";
    rr:termType rr:Literal.