syntax-1.rb

table :owners do
  row :brian do
    name 'Brian'
    age   35
  end
end

table :dogs do
  row :boomer do
    name 'Boomer'
    age   1.5
  end

  row :wiley do
    name 'Wiley'
    age   12
  end
end

syntax-2.rb

table :owners do |t|
  t.row :brian do |r|
    r.name = 'Brian'
    r.age  =  35
  end
end

table :dogs do |t|
  t.row :boomer do |r|
    r.name  = 'Boomer'
    r.age   =  1.5
  end

  t.row :wiley do |r|
    r.name = 'Wiley'
    r.age  =  12
  end
end

syntax-3.rb

owners do
  brian do
    name 'Brian'
    age   35
  end
end

dogs do
  boomer do
    name 'Boomer'
    age   1.5
  end

  wiley do
    name 'Wiley'
    age   12
  end
end