Domain Extension Index

Special domain codes for industry-specific applications.

Financial Technology (F001-F099)

Code Range	Technical Domain	Key Applications
F001-F019	High-Precision Computing	Decimal, currency calculations
F020-F039	Trading Systems	Order matching, risk control
F040-F059	Blockchain	Smart contracts, DeFi
F060-F079	Risk Management	Risk engines, anti-fraud
F080-F099	Regulatory Compliance	KYC, AML

Key Crates

rust_decimal, chrono, uuid
serde, tokio

Related Meta-Questions

m01, m06, m07, m10

Machine Learning (M001-M099)

Code Range	Technical Domain	Key Applications
M001-M019	Tensor Operations	ndarray, GPU acceleration
M020-M039	Model Inference	ONNX, TensorFlow
M040-M059	Data Processing	Feature engineering, ETL
M060-M079	Distributed Training	Parallel computing
M080-M099	MLOps	Model serving, monitoring

Key Crates

ndarray, tract, candle
tch-rs, polars

Related Meta-Questions

m04, m07, m10, m11

Cloud Native (CN001-CN099)

Code Range	Technical Domain	Key Applications
CN001-CN019	Containerization	Docker, microservices
CN020-CN039	Kubernetes	CRD, Operator
CN040-CN059	Service Mesh	Istio, traffic management
CN060-CN079	Observability	Monitoring, tracing
CN080-CN099	Serverless	FaaS, edge computing

Key Crates

tonic, kube, tracing
opentelemetry, bollard

Related Meta-Questions

m06, m07, m10, m12

Internet of Things (IoT001-IoT099)

Code Range	Technical Domain	Key Applications
IoT001-IoT019	Edge Computing	Local inference, data aggregation
IoT020-IoT039	Device Management	OTA, remote control
IoT040-IoT059	Communication Protocols	MQTT, CoAP
IoT060-IoT079	Data Collection	Sensor networks
IoT080-IoT099	Security Protection	Device authentication, encryption

Key Crates

embedded-hal, embassy, rtic
rumqttc, defmt

Related Meta-Questions

m01, m07, unsafe-checker, m10

Related Tech Categories

700-759: Embedded Development Layer

Cross-Reference

Domain	Primary Categories	Secondary Categories
FinTech	F001-F099	040-043 (Error), 120-139 (Concurrency)
ML	M001-M099	020-029 (Types), 250-279 (Async)
Cloud Native	CN001-CN099	200-299 (Web), 250-279 (Async)
IoT	IoT001-IoT099	700-759 (Embedded), 880-889 (Unsafe)

Usage Examples

-- Find all FinTech high-precision computing issues
SELECT * WHERE category LIKE 'F001%' OR category LIKE 'F01%'

-- Find embedded IoT with real-time constraints
SELECT * WHERE category BETWEEN 'IoT040' AND 'IoT059'
  OR category BETWEEN '740' AND '749'

-- Find cloud-native observability patterns
SELECT * WHERE category LIKE 'CN06%'