A value an expression is evaluated against or reports.
Covers the four value types XPath 1.0 defines: the nodes a parsed tree holds, the attributes a selection reaches, and
the strings, numbers and booleans an expression computes. Whatever a selection reports is thus the target of a
further selection in its turn, a computed value selecting nothing, as one holds no tree to select from.
A value an expression is evaluated against or reports.
Covers the four value types XPath 1.0 defines: the nodes a parsed tree holds, the attributes a selection reaches, and the strings, numbers and booleans an expression computes. Whatever a selection reports is thus the target of a further selection in its turn, a computed value selecting nothing, as one holds no tree to select from.