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Throughout this module are classes that correspond to nodes
in the XML document tree. Each such class will typical
contain a static .readNode() method that
converts a DOM tree Element node into a
class instance, and a regular (non-static) .writeNode() method that converts the content of
an instance back into a DOM Element node.
Because all these functions have the same interface, we
define those interfaces here. The et module
is the lxml.etree module.
.readNode(node): # Static method
[ node is an et.Element node ->
if node conforms to birdnotes.rnc ->
return a new class instance that represents that node
else -> raise IOError ]
.writeNode(parent):
[ parent is an et.Element instance ->
parent := parent with a new et.Element added
representing self
return that new et.Element ]