digraph { node[shape=plaintext] header [ shape=record label="{ Header | ... | Table#1 | Table#2 | ... }" ] tbl1 [ label=<

Table#1
File | Name | Gender
alice.wav | Alice | female
bob.wav | Bob | male

>] tbl2 [ label=<

Table#2
File | Start | End | Text
alice.wav | 0.2 | 1.1 | Hi, I'm Alice
bob.wav | 1.4 | 3.0 | How are you doing?
alice.wav | 3.4 | 4.7 | Thanks, I'm good!

>] header:tbl1 -> tbl1 header:tbl2 -> tbl2 }