Added NodeMap to all low level objects.

this sync map tracks all the nodes that apply to this object.

datamodel/low/base/xml.go

@@ -30,6 +30,7 @@ type XML struct {
 	Extensions *orderedmap.Map[low.KeyReference[string], low.ValueReference[*yaml.Node]]
 	RootNode   *yaml.Node
 	*low.Reference
+	low.NodeMap
 }
 
 // Build will extract extensions from the XML instance.
@@ -38,6 +39,7 @@ func (x *XML) Build(root *yaml.Node, _ *index.SpecIndex) error {
 	utils.CheckForMergeNodes(root)
 	x.RootNode = root
 	x.Reference = new(low.Reference)
+	x.Nodes = low.ExtractNodes(nil, root)
 	x.Extensions = low.ExtractExtensions(root)
 	return nil
 }