# priority_queue > Every PAG keyword record, with what grounds it and how it is checked. Page: Ontology · Grammar Canonical: https://banes-lab.com/ontology/grammar#pag-keywords-priority-queue Listed in [Ontology · Grammar](https://banes-lab.com/api/pages/ontology/grammar.md), after [dag](https://banes-lab.com/ontology/grammar/pag-keywords-dag.md) and before [flowchart](https://banes-lab.com/ontology/grammar/pag-keywords-flowchart.md). Every PAG keyword record, with what grounds it and how it is checked. ### PRIORITY_QUEUE Details Meaning Queue declaration · makes a ranking explicit; the branch ranking a worth gate emits is one Example PRIORITY_QUEUE branches: Grounds [node:tel-priority](https://banes-lab.com/records/reasoning/node-tel-priority.md) How it is checked Checked by a structured-document validator that parses each document against the grammar and reports every defect by its shape Population Every agent and template document the validator walks, and every occurrence of the keyword in them Freshness A verdict stands until the grammar data or a document that uses the keyword changes Refusal The validation stage fails the gate on any defect code, so a document with a malformed keyword does not ship Observation None, because a keyword is static text in a document, and nothing observes it while a run executes Evidence Watched to fire and to accept: a suite plants a retired head in a real template and validates every agent and template on disk clean Authoritative side The grammar data, which every keyword in a document conforms to Depends on Not answered Shape it refuses Not answered ### PRIORITY Details Meaning Priority value · utility minus cost Example PRIORITY = 10 Grounds [node:tel-utility](https://banes-lab.com/records/reasoning/node-tel-utility.md), [node:tel-cost](https://banes-lab.com/records/reasoning/node-tel-cost.md) How it is checked Checked by a structured-document validator that parses each document against the grammar and reports every defect by its shape Population Every agent and template document the validator walks, and every occurrence of the keyword in them Freshness A verdict stands until the grammar data or a document that uses the keyword changes Refusal The validation stage fails the gate on any defect code, so a document with a malformed keyword does not ship Observation None, because a keyword is static text in a document, and nothing observes it while a run executes Evidence Watched to fire and to accept: a suite plants a retired head in a real template and validates every agent and template on disk clean Authoritative side The grammar data, which every keyword in a document conforms to Depends on Not answered Shape it refuses Not answered ### ENQUEUE Details Meaning Add to queue Example ENQUEUE task TO q Grounds [pattern-type:combinatorics](https://banes-lab.com/records/reasoning/pattern-type-combinatorics.md) How it is checked Checked by a structured-document validator that parses each document against the grammar and reports every defect by its shape Population Every agent and template document the validator walks, and every occurrence of the keyword in them Freshness A verdict stands until the grammar data or a document that uses the keyword changes Refusal The validation stage fails the gate on any defect code, so a document with a malformed keyword does not ship Observation None, because a keyword is static text in a document, and nothing observes it while a run executes Evidence Watched to fire and to accept: a suite plants a retired head in a real template and validates every agent and template on disk clean Authoritative side The grammar data, which every keyword in a document conforms to Depends on Not answered Shape it refuses Not answered ### DEQUEUE Details Meaning Remove from queue Example DEQUEUE FROM q Grounds [pattern-type:combinatorics](https://banes-lab.com/records/reasoning/pattern-type-combinatorics.md) How it is checked Checked by a structured-document validator that parses each document against the grammar and reports every defect by its shape Population Every agent and template document the validator walks, and every occurrence of the keyword in them Freshness A verdict stands until the grammar data or a document that uses the keyword changes Refusal The validation stage fails the gate on any defect code, so a document with a malformed keyword does not ship Observation None, because a keyword is static text in a document, and nothing observes it while a run executes Evidence Watched to fire and to accept: a suite plants a retired head in a real template and validates every agent and template on disk clean Authoritative side The grammar data, which every keyword in a document conforms to Depends on Not answered Shape it refuses Not answered ### PEEK Details Meaning View top item · the selected branch Example PEEK queue Grounds [node:tel-priority](https://banes-lab.com/records/reasoning/node-tel-priority.md) How it is checked Checked by a structured-document validator that parses each document against the grammar and reports every defect by its shape Population Every agent and template document the validator walks, and every occurrence of the keyword in them Freshness A verdict stands until the grammar data or a document that uses the keyword changes Refusal The validation stage fails the gate on any defect code, so a document with a malformed keyword does not ship Observation None, because a keyword is static text in a document, and nothing observes it while a run executes Evidence Watched to fire and to accept: a suite plants a retired head in a real template and validates every agent and template on disk clean Authoritative side The grammar data, which every keyword in a document conforms to Depends on Not answered Shape it refuses Not answered ### HEAPIFY Details Meaning Reorder queue Example HEAPIFY queue Grounds [pattern-type:combinatorics](https://banes-lab.com/records/reasoning/pattern-type-combinatorics.md) How it is checked Checked by a structured-document validator that parses each document against the grammar and reports every defect by its shape Population Every agent and template document the validator walks, and every occurrence of the keyword in them Freshness A verdict stands until the grammar data or a document that uses the keyword changes Refusal The validation stage fails the gate on any defect code, so a document with a malformed keyword does not ship Observation None, because a keyword is static text in a document, and nothing observes it while a run executes Evidence Watched to fire and to accept: a suite plants a retired head in a real template and validates every agent and template on disk clean Authoritative side The grammar data, which every keyword in a document conforms to Depends on Not answered Shape it refuses Not answered ### COMPARE_BY Details Meaning Comparison function Example COMPARE_BY priority Grounds [pattern-type:combinatorics](https://banes-lab.com/records/reasoning/pattern-type-combinatorics.md) How it is checked Checked by a structured-document validator that parses each document against the grammar and reports every defect by its shape Population Every agent and template document the validator walks, and every occurrence of the keyword in them Freshness A verdict stands until the grammar data or a document that uses the keyword changes Refusal The validation stage fails the gate on any defect code, so a document with a malformed keyword does not ship Observation None, because a keyword is static text in a document, and nothing observes it while a run executes Evidence Watched to fire and to accept: a suite plants a retired head in a real template and validates every agent and template on disk clean Authoritative side The grammar data, which every keyword in a document conforms to Depends on Not answered Shape it refuses Not answered ## Links to - [Branch Priority](https://banes-lab.com/records/reasoning/node-tel-priority.md) - [Branch Utility](https://banes-lab.com/records/reasoning/node-tel-utility.md) - [Branch Cost](https://banes-lab.com/records/reasoning/node-tel-cost.md) - [Combinatorics](https://banes-lab.com/records/reasoning/pattern-type-combinatorics.md)