[YAML] Allow duplicate keys in yaml document about sparql.anything

[justin2004]

could you upload the xml file? or a small file that produces the error

[enridaga]

Added a query in the sandbox project to reproduce this error:

PREFIX fx:  <http://sparql.xyz/facade-x/ns/>

select * where
{
    service <x-sparql-anything:> {
        fx:properties fx:content """
        key: value
        key1: "value2"
        another-key: 123
        key1: "Repeated!"
        """ ; fx:triplifier "io.github.sparqlanything.yaml.YAMLTriplifier".
        
        ?s ?p ?o
    }
}

I am getting:

[main] ERROR io.github.sparqlanything.engine.FacadeXOpExecutor - An error occurred: while constructing a mapping
 in Custom user configuration, line 2, column 9:
            key: value
            ^
found duplicate key key1
 in Custom user configuration, line 5, column 9:
            key1: "Repeated!"
            ^

Exception in thread "main" java.lang.RuntimeException: java.io.IOException: while constructing a mapping
 in Custom user configuration, line 2, column 9:
            key: value
            ^
found duplicate key key1
 in Custom user configuration, line 5, column 9:
            key1: "Repeated!"
            ^

	at io.github.sparqlanything.engine.FacadeXOpExecutor.execute(FacadeXOpExecutor.java:140)