The class GenericSAXImpl is useful as a base class for SAXalizable
classes that wish to store the information from arbitrary XML subtags.
GenericSAXImpl stores all attributes and all subtags that are
seen for the tag that corresponds to it, and in addition will create
GenericSAXImpl children so that subtags are also stored
recursively.
Ultimately we will arrive at a GenericSAXImpl leaf node, which
has no children (although it may have attributes), and contains a String
representing the text of the node.
findChild(String tagname) Return the child object corresponding to the tag with the given name.
Parameters: tagname - The tag name that the child object is required for.
Return the child object corresponding to the tag with the given name.
Parameters: tagname - The tag name that the child object is required for. The required child object, or null if not found.