XML by Example

Figure 7.8: Running the conversion utility

You recognize many elements from the previous listing. The novelty is in

functions

walkNode() and walkProduct().

walkNode() is very similar to searchPrice(). It walks down the tree looking

for product elements. When it finds a product, it calls walkProduct().

walkProduct() is a specialized function that processes only product ele-

ments. However, by virtue of being specialized, it knows that a product ele-

ment contains a name element and a price element. It therefore extracts

information from both the name and the price elements. This function

maintains state information: It knows it is in a product element ...