Pointer Validation

If you do not suppress pointer-validation, makeinfo will check the validity of the final Info file. Mostly, this means ensuring that nodes you have referenced really exist. Here is a complete list of what is checked:

1. If a `Next', `Previous', or `Up' node reference is a reference to a node in the current file and is not an external reference such as to `(dir)', then the referenced node must exist.
2. In every node, if the `Previous' node is different from the `Up' node, then the `Previous' node must also be pointed to by a `Next' node.
3. Every node except the `Top' node must have an `Up' pointer.
4. The node referenced by an `Up' pointer must contain a reference to the current node in some manner other than through a `Next' reference. This includes menu entries and cross references.
5. If the `Next' reference of a node is not the same as the `Next' reference of the `Up' reference, then the node referenced by the `Next' pointer must have a `Previous' pointer that points back to the current node. This rule allows the last node in a section to point to the first node of the next chapter.

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