sdd:AllChildren
An sdd:AllChildren is the intent materialized by all <curie> children of <resource> — the object of a sdd:Group's sdd:intent. It names two things: sdd:of, the root resource, and sdd:via, the membership predicate pointing from a child back to that root (for example plant:partOf).
The claim an sdd:AllChildren carries is exhaustiveness: every resource related to sdd:of through sdd:via belongs in the group, not just the ones the author happened to depict. A group's subject defaults to its intent's sdd:of when no explicit subject line overrides it, so a grounded title binds against the root the membership is exhaustive over. Because the intent names the whole membership condition rather than an enumerated list, the appearance of a new member at the source — a resource newly related via sdd:via that the diagram never depicted — is a divergence the intent makes detectable, unlike an intent-less group's plain enumeration.