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enriched-qwen3-coder-next/Common/DTS.CommonCore/Enums/Channels.md

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+---
+source_files:
+  - Common/DTS.CommonCore/Enums/Channels/ChannelCodeType.cs
+generated_at: "2026-04-16T02:44:43.138694+00:00"
+model: "Qwen/Qwen3-Coder-Next-FP8"
+schema_version: 1
+sha256: "de8650eabd4f19a6"
+---
+
+# Channels
+
+### **Purpose**  
+This module defines shared enumerations and constants related to channel code types within the DTS system. It standardizes the representation and validation of channel codes—specifically distinguishing between standardized ISO 13499-compliant codes and custom user-defined codes—ensuring consistency across modules that handle channel identification and data exchange.
+
+---
+
+### **Public Interface**  
+All members are defined in the nested `ChannelCodeType` enum and constant fields inside the `ChannelEnumsAndConstants` class:
+
+- **`ChannelEnumsAndConstants.ChannelCodeType`**  
+  *Type:* `enum`  
+  *Values:*  
+  - `ISO` — Represents an ISO 13499-compliant channel code.  
+  - `User` — Represents a user-defined channel code.  
+
+- **`ChannelEnumsAndConstants.IsoCodeTypeString`**  
+  *Type:* `const string`  
+  *Value:* `"ISO 13499"`  
+  *Purpose:* Human-readable identifier for the ISO channel code type; likely used for serialization, logging, or UI display.
+
+- **`ChannelEnumsAndConstants.UserCodeTypeString`**  
+  *Type:* `const string`  
+  *Value:* `"User"`  
+  *Purpose:* Human-readable identifier for the user-defined channel code type.
+
+- **`ChannelEnumsAndConstants.ISO_CODE_LENGTH`**  
+  *Type:* `const int`  
+  *Value:* `16`  
+  *Purpose:* Expected fixed length (in characters) of an ISO-compliant channel code string.
+
+- **`ChannelEnumsAndConstants.USER_CODE_LENGTH`**  
+  *Type:* `const int`  
+  *Value:* `50`  
+  *Purpose:* Maximum allowed length (in characters) of a user-defined channel code string.
+
+---
+
+### **Invariants**  
+- A channel code string of type `ISO` **must** be exactly `16` characters long (`ISO_CODE_LENGTH`).  
+- A channel code string of type `User` **must not exceed** `50` characters (`USER_CODE_LENGTH`).  
+- The enum `ChannelCodeType` has only two valid values: `ISO` and `User`. No other states are defined.  
+- The string constants `IsoCodeTypeString` and `UserCodeTypeString` are fixed and must not be modified at runtime.
+
+---
+
+### **Dependencies**  
+- **Internal:** Depends only on core .NET types (`string`, `int`, `enum`). No external NuGet or third-party dependencies.  
+- **Consumers:** Likely referenced by modules handling channel configuration, message parsing, or data validation (e.g., serialization/deserialization logic, UI components, or database mapping layers). The namespace `DTS.Common.Enums.Channels` suggests it is part of a shared `DTS.CommonCore` library used across multiple components.
+
+---
+
+### **Gotchas**  
+- The `ChannelCodeType` enum is defined *inside* a class (`ChannelEnumsAndConstants`) rather than as a top-level type—this is unconventional for enums and may cause confusion (e.g., `ChannelEnumsAndConstants.ChannelCodeType` vs. `ChannelCodeType`).  
+- No validation logic is provided in this module; consumers must enforce length constraints (`ISO_CODE_LENGTH`, `USER_CODE_LENGTH`) themselves.  
+- The `IsoCodeTypeString` and `UserCodeTypeString` values are hardcoded strings; mismatched usage (e.g., `"ISO"` instead of `"ISO 13499"`) could cause interoperability issues if external systems expect exact string matches.  
+- No documentation is provided on how `ChannelCodeType` maps to actual channel code strings (e.g., encoding scheme for ISO codes).