question: isvalidnode returns true if this node is valid ; false otherwise . concode_field_sep boolean valid concode_elem_sep Object item concode_field_sep TreeNode parent concode_elem_sep Object item concode_elem_sep int children concode_elem_sep void removeLeaf concode_elem_sep void insertChild concode_elem_sep TreeNode nextSibling concode_elem_sep void setItem concode_elem_sep TreeNode child
target: boolean function ( ) { return valid ; }