# var xml = code.to_xml
# assert xml["animal"].first["tiger"].first.as(XMLStartTag).data == "This is a white tiger!"
# ~~~
- fun data: String
+ fun data: nullable String
do
for child in children do
if child isa PCDATA then return child.content
if child isa CDATA then return child.content
end
- abort
+ return null
end
end