for tree in trees: # Hello,

# ("word-element","Hello")

nodetype=tree[0] # "word-element"

if nodetype == "word-element":

graphics.word(tree[1])

elif nodetype == "tag-element":

# <b>Strong text</b>

tagname = tree[1] # b

tagargs = tree[2] # []

subtrees = tree[3] # ...Strong Text!...

closetagname = tree[4] # b

if tagname != closetagname:

graphics.warning("mismatched tag")

else:

graphics.begintag(tagname,tagname)

interpret(subtrees)