Wrong expansion of JSON-LD - json-ld

Question

I'm learning to work with JSON-LD and I'm stuck on this problem. This is mine document...
{
"#context": {
"dbr": "http://dbpedia.org/resource/",
"xsd": "http://www.w3.org/2001/XMLSchema#",
"italy": "dbr:Italy_national_football_team",
"ita_player_base_url": "italy:/",
"foaf": "http://xmlns.com/foaf/0.1/",
"team": "foaf:Organization",
"player": "foaf:Person",
"player_of": {
"#id": "foaf:member",
"#type": "#id"
},
"plays_with": {
"#id": "foaf:knows",
"#type": "#id"
},
"name": {
"#id": "foaf:name",
"#type": "xsd:string"
},
"number": {
"#id": "foaf:status",
"#type": "xsd:positiveInteger"
}
},
"#graph": [{
"name": "Buffon",
"number": "1",
"#type": "player",
"player_of": "italy",
"#id": "ita_player_base_url:Buffon"
}, {
"name": "Insigne",
"number": "20",
"#type": "player",
"player_of": "italy",
"#id": "ita_player_base_url:Insigne",
"plays_with": "ita_player_base_url:Buffon"
}]}
Then if I paste it to a JSON-LD to GIF service (or to everything else) I get that the players are "player_of":"domainOfTheValidator/italy" instead of "player_of":"http://dbpedia.org/resource/Italy_national_football_team"
Why is this happening? Obviously if I put "player_of": "dbr:Italy_national_football_team" instead of "player_of": "italy" it works... I'm getting crazy.

Answer 1

A compact IRI consists of a prefix, followed by :, followed by a suffix.
With "italy": "dbr:Italy_national_football_team" you are defining the prefix (italy). When you want to use it in a value, you have to use the colon (:) followed by a suffix (which is empty in your case).
So instead of
"player_of": "italy",
you would have to use
"player_of": "italy:",