[jdom-interest] What is a jdom context?

[Syloke Soong]

Given a jdom doc and a jdom xpath,
I wish to extract whatever this xpath is pointing to in the doc.

The jdom javadoc for class XPath says,

selectNodes(java.lang.Object context, java.lang.String path) 
Evaluates an XPath expression and returns the list of selected items.
Parameters:
context - the node to use as context for evaluating the XPath expression


Well, what is a context or node? What should I use as argument context:
I am thinking of possibilities:
1. A jdom Document
2. A jdom Element
3. A sax InputSource
4. All of the above

IMPHO (in my projected humble opinion) it would be convenient (at least
for me) if context was a definite object similar to the way sax
InputSource so we would know determinately what is acceptable as a
"node" or "context".

Anyway, the question that led to this discussion is,
How do I extract from a jdom document using a jdom xpath (without
straying into jaxen).
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