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    {"id":"D2","block":"block-pe-stub.svg","at":[150,30],"repere":"COF-AC"},
    {"id":"D3","block":"block-pe-stub.svg","at":[260,30],"repere":"TGBT"},
    {"id":"D4","block":"block-pe-stub.svg","at":[370,30],"repere":"Ond1"},
    {"id":"DGT","block":"symbol-dgt.svg","at":[20,170],"repere":"DGT"},
    {"id":"PT","block":"symbol-prise-terre.svg","at":[200,235],"repere":""}
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    {"from":"D2.PE","to":"DGT.RAIL","type":"pe"},
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}