Are Nodes like Types?

I am trying to understand Context in Web Dynpro. I know that Context is data storage in WDP. But how is Nodes and Attributes related to a standard ABAP program. Are nodes like Types and Attributes the actual fields?
So if I create a type
TYPES: begin of itab,
matnr type mara-matnr,
maktx type mara-maktx,
end of itab.
Is this the same as create a Node called itab with 2 attributes matnr and maktx? And then if I set the cardinality of the node to 0 .. n then it would become an internal table instead of just a structure. Am I understanding this correctly?

Yes your description is quite correct.  In fact when you declare a node, there is a matching type that gets generated.  And depending upon the cardinality, internally either an ABAP structure or Internal Table is also generated.  The Node is just a platform independent way of modeling ABAP data.  This way Web Dynpro ABAP and Java can have the same way of describing data, yet different internal implementations.

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    regards
    siva

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