A list of all tables

Return a json with a node for tables with a array of strings of all tables defined in the system or null if no tables defined

Ex. strres := DEOS("@GetDefinition", "listtables")

{
  "result": "ok",
  "tables": [
    "Address",
    "Documents"
  ]
}

A list of tables in a system with only two defined

{
  "result": "ok",
  "tables": null
}

No tables defined in this list