{
  "name": "m_min",
  "type": "function",
  "description": "Returns the minimum m (measure) value of a geometry.",
  "arguments": [ {"arg":"geometry","description":"a geometry containing m values"}],
  "examples": [ { "expression":"m_min( make_point_m( 0,0,1 ) )", "returns":"1"},
                { "expression":"m_min(make_line( make_point_m( 0,0,1 ), make_point_m( -1,-1,2 ), make_point_m( -2,-2,0 ) ) )", "returns":"0"}
  ]
}