public MainRecordDef(DefinitionManager manager, JObject src)
: base(manager, src)
{
ErrorHelpers.CheckDefProperty(src, "signature");
_signature = src.Value <string>("signature");
headerDef = BuildHeaderDef(src.Value <JObject>("flags"));
containedInDef = (FormIdDef)JsonHelpers.Def(manager, src, "containedInElement");
}