[graphviz-interest] How to add and get custom attributes from dot-file?

Hi all!
I am using  cgraph  for loading and parsing of a graph description
from a dot-file.
Now I need to add a custom  attributes to the nodes in the file and
have access to them after the  file reading to the memory. How can I
do that?

As far as I know, an attribute "comment" could be used.  But  this way
is tricky, if I want to add several attributes.

Best regards,
Igor
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