Compare meta tag with what is used in other parts of bbop stack about obographs

[cmungall]

Example of synonyms:

     "id" : "http://purl.obolibrary.org/obo/GO_0005575",
      "meta" : {
        "definition" : {
          "val" : "The part of a cell or its extracellular environment in which a gene product is located. A gene product may be located in one or more parts of a cell and its location may be as specific as a particular macromolecular complex, that is, a stable, persistent association of macromolecules that function together.",
          "xrefs" : [ "GOC:go_curators", "NIF_Subcellular:sao-1337158144" ]
        },
        "synonyms" : [ {
          "pred" : "hasExactSynonym",
          "val" : "cellular component",
          "xrefs" : [ ],
          "exact" : true
        }, {
          "pred" : "hasRelatedSynonym",
          "val" : "subcellular entity",
          "xrefs" : [ "NIF_Subcellular:nlx_subcell_100315" ],
          "exact" : false
        }, {
          "pred" : "hasExactSynonym",
          "val" : "cell or subcellular entity",
          "xrefs" : [ ],
          "exact" : true
        } ]
      },