An implementation of the W3C's DOM interfaces can be found in
org.risource.dps.tree, with
extended interfaces for ``active nodes'' in
org.risource.dps.active.
The DPS uses a set of interfaces that are almost completely orthogonal to those of the DOM. While the DOM's interfaces model a document as a (doubly-linked) tree of Node objects, the DPS interfaces define a family of cursors that allow the processor to traverse a tree. The advantage of the cursorial approach over the arboreal is that the tree being traversed need not all be in memory at once.
In spite of the cursorial interface's advantages, it is sometimes necessary to construct an actual parse tree. The DOM, though perhaps not the best interface for this kind of thing, works well enough. The tree subdirectory contains a complete implementation of the DOM which also implements the ``Active'' interface required for the DPS, and the navigational methods required for an efficient implementation of cursors.
This package, org.risource.dom, is meant to contain utility
classes that use the ``pure'' DOM interfaces from
org.w3c.dom.
This directory originally contained a complete collection of interfaces and implementation classes for an earlier version of the DOM.
Now that the ``official'' interfaces are in org.w3c.dom we have taken the
opportunity to correct the situation.