Potential document child, so an element, processing instruction or comment
Arbitrary comment node
Arbitrary element node, offering the ClarkElemApi with HasChildNodesApi
element query API
Arbitrary entity reference node
Arbitrary node
Arbitrary processing instruction node
Arbitrary text node
Core API for element nodes that offer the central
ClarkElemApi with HasChildNodesApi
query API. Each element implementation should directly or indirectly implement this API.This API is directly implemented by elements that know about expanded names but not about qualified names.