• discourse node

    • as defined in your grammar (e.g., base grammar will include CLM or EVD, for example)

  • block

  • page

It is not possible to directly specify that a source or target node in a relation pattern is a block or page. These are variables that are defined implicitly at the moment, by what incoming and/or outgoing relations it connects to.

For example, if a node's incoming relation is references, that implies it is a page. Similarly, if the node's incoming relation is has child or has ancestor, that implies the node is a block.

When in doubt, check the preview of your relation pattern to ensure you're correctly expressing your intentions!

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