From Compressed Evidence to Graph Edges¶
Specification¶
The full specification below is extracted from Chapter 7: The Property Graph Data Model.
Type: infographic
**sim-id:** compressed-evidence-graph-edges<br/>
**Library:** Mermaid<br/>
**Status:** Specified<br/>
**Template:** https://github.com/dmccreary/learning-graphs/tree/main/docs/sims/graph-viewer<br/>
Bloom Taxonomy: Understand (L2)
Bloom Taxonomy Verb: trace, explain
Learning objective: Let the learner trace how a Student node connects to compressed summary vertices through the Has Mastery, Of Concept, and Touched relationships, and explain what question each edge answers, without needing the compression mechanics Chapter 8 covers.
Purpose: Show two short, parallel Mermaid flowchart branches, both starting from a single "Student" node, so the learner can see the mastery path and the engagement path as structurally similar patterns.
Branch A (mastery path): "Student" —`HAS_MASTERY`→ "ConceptMastery (summary vertex)" —`OF_CONCEPT`→ "Concept".
Branch B (engagement path): "Student" —`HAD_SESSION`→ "LearningSession (summary vertex)" —`TOUCHED`→ "Page / MicroSim / Question", with a small annotation box off the `TOUCHED` edge reading "carries event_count, dwell_ms".
Interactive features: Every node has a Mermaid `click` directive. Clicking "Student" opens an infobox recalling the pseudonymous Student node from Chapter 6. Clicking "ConceptMastery" or "LearningSession" opens an infobox stating that both are materialized summary vertices — compressed from many statements into one — with a note "full compression mechanics: Chapter 8." Clicking "Concept" opens an infobox tying back to the Learning Graph DAG. Clicking the `HAS_MASTERY`, `OF_CONCEPT`, or `TOUCHED` edge label opens an infobox naming the relationship type and its from → to direction, matching this chapter's prose.
Color coding: The mastery branch in the book's teal accent color; the engagement branch in a complementary amber, so the two parallel paths stay visually distinguishable at a glance.
Implementation: Mermaid flowchart with two branches sharing a root node, full click-to-infobox coverage on every node and edge label. Responsive width tracking the containing element.