A compact reference for the terms used throughout OrchidDB’s documentation.
| Term | Meaning |
|---|
| Node / vertex | An identified graph element with labels and properties. |
| Relationship / edge | A typed connection from a source node to a destination node. |
| Label | A name such as Person that identifies a group of nodes. |
| Relationship type | A name such as FOLLOWS that identifies a group of edges. |
| Property | A named value on a node or relationship. |
| Path | A sequence of connected nodes and relationships. |
| Traverser | The item of traversal state passed between Gremlin steps. |
| Binding | A named value produced during query evaluation. |
| Term | Meaning |
|---|
| Graph mapping | The contract between graph labels/properties and relational tables/columns. |
| Node mapping | A source relation, identity column, and property columns for a label. |
| Edge mapping | A source relation, endpoint columns and labels, and optional edge identity and properties. |
| Query-backed mapping | A graph source defined by a SQL query. |
| Schema provider | Table metadata used by the relational planner. |
| Ontology mapping | The association of RDF vocabulary with graph labels, properties, and relationships. |
| RDF mapping | A rule exposing subject, predicate, object, and optional graph terms over source columns. |
| Logical source | A named relation backed by equivalent physical layouts selected using partition metadata. |
| Collection source | A named, read-only relation expanding a typed list expression, including JSON row functions. |
| Quad source | A relational representation of RDF subject, predicate, object, and graph. |
| Term | Meaning |
|---|
| Graph IR | The intermediate graph representation shared by language frontends. |
| Lowering | Transforming a plan into another representation while preserving its meaning. |
| SQL island | A region of the lowered relational plan executed as SQL in DuckDB. |
| Hybrid execution | A DataFusion execution DAG combining DuckDB SQL regions and native kernels. |
| Arrow batch | A columnar result represented by an Apache Arrow RecordBatch. |
| Checkpoint | A compact persisted snapshot of managed graph records. |
| Snapshot isolation | A transaction’s consistent database view, combined with its own writes. |
| Term | Meaning |
|---|
| IRI | An Internationalized Resource Identifier used to name an RDF resource. |
| Triple | An RDF statement with subject, predicate, and object. |
| Quad | A triple together with its graph. |
| Default graph | The graph matched by unqualified triple patterns in the active dataset. |
| Named graph | An RDF graph identified by an IRI. |
| Vocabulary | Class and predicate IRIs used to describe a domain. |
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