LDC-Q1004 — A snapshot node carries no identifier

What it means

Every node in a snapshot carries an identifier that joins, labels, and anchors all refer to. A node without one cannot be joined with anything, so the engine stops the load at that node instead of building a store with dangling references.

Give the node its identifier at the snapshot source, then run the query again. The query text itself is not at fault.

Example

run

{"argv": ["query", "from r in rules select r", "--path", "$ROOT/world.json"], "expect": "LDC-Q1004", "files": {"world.json": "{\"nodes\": [{\"kind\": \"type_decl\"}], \"package\": {\"name\": \"demo.diagnostics\", \"namespace\": \"urn:law:demo:diagnostics\"}}"}}

Fix

run

{"argv": ["query", "from r in rules select r", "--path", "$ROOT/world.json"], "expect": "LDC-Q1004", "files": {"world.json": "{\"nodes\": [{\"id\": \"n1\", \"kind\": \"type_decl\"}], \"package\": {\"name\": \"demo.diagnostics\", \"namespace\": \"urn:law:demo:diagnostics\"}}"}}

Engine message

The engine reports this in its own wording:

Output

LDC-Q1004: $ROOT/world.json: node type_decl without id.

Related

• Questions to the engine — what a snapshot carries.
• LDC-Q1001 — when a node kind is outside the schema.