Set the vector where nodes will be cached.
Add the node into a vector of nodes where it should occur in document order.
If this NodeSequence has a cache, and that cache is fully populated then this
method returns true, o
Get the cache (if any) of nodes obtained from the iterator so far. Note that the
cache keeps growing
If this iterator needs to cache nodes that are fetched, they are stored in the
Vector in the generic
If the iterator needs to cache nodes as they are fetched, then this method
If this NodeSequence has a cache, mark that it is complete. This method should
be called after the i