The functions described in this section neither add to nor delete from the network. Rather, they compute and return sets either of nodes or of unitpaths.
({node}
)
A list of nodes at the top level of the SNePSUL loop, or in a context
where a node set is required, is treated as an expression whose value is
a set of the nodes in the list.
(*
symbol)
A macro command function which returns the set of nodes in the value of
the SNePSUL variable symbol.
(list-nodes
[context-name])
Returns the set of all nodes
that are in the context named context-name. If
context-name is omitted, returns the set of all nodes that are in
*defaultct.
(^ S-expression
)
The set of nodes obtained by evaluating the Lisp S-expression.
(&
nodeset nodeset)
Infix function that returns the intersection of the two nodesets.
(+
nodeset nodeset)
Infix function that returns the union of the two nodesets.
(-
nodeset nodeset)
Infix function that returns the set of nodes in the first
nodeset but not in the second nodeset.
(=
nodeset symbol)
Infix function that assigns the nodeset to be the
value of the SNePSUL variable symbol.
(_
nodeset unitpathset)
Infix function that returns the set of those nodes in the nodeset
which do not have any of the unitpaths in the unitpathset emanating from
them.
(>
unitpathset symbol)
Infix function that assigns the unitpathset to be the value of the
SNePSUL variable symbol.
({unitpath})
A list of unitpaths in a context where a unitpathset is required, is treated as an expression whose value is a
set of the unitpaths in the list.