LDC-Q0004 — A named query needs a parameter value

What it means

Some catalog queries carry placeholders for values only the caller knows — which predicate to describe, which package to search. Each placeholder must be filled when the query runs. When one is left empty, the engine stops and names the missing value instead of guessing it.

Supply the missing value alongside the query name and run it again. The query text itself stays as published in the catalog.

Example

LawQL

producers

Fix

LawQL

from r in rules select r

Engine message

The engine reports this in its own wording:

Output

LDC-Q0004: named query 'producers' requires parameter predicate (--param predicate=…).

Related

• Questions to the engine — how catalog queries take values.