public override (Parser <TermNode> Parser, TTermOption TermOption) Build()
{
var op = _operatorParser.Build();
var parser = Terms.Text(Name, caseInsensitive: true)
.AndSkip(Literals.Char(':'))
.And(op.Parser)
.Then <TermNode>(static x => new NamedTermNode(x.Item1, x.Item2));