is.VariableDefinition(x)

is.VarDef(x)

is.script(x)

is.dataset(x)

is.CrunchExpr(x)

is.Expr(x)

is.Geodata(x)

is.shoji(x)

is.variable(x)

is.Numeric(x)

is.Categorical(x)

is.Text(x)

is.Datetime(x)

is.Multiple(x)

is.MR(x)

is.MultipleResponse(x)

is.CA(x)

is.CategoricalArray(x)

is.NumericArray(x)

is.Array(x)