Ubiquitous Language

Process

1. Scan the conversation，寻找 domain-relevant nouns、verbs 和 concepts
2. Identify problems：
   • 同一个词被用于不同 concepts（ambiguity）
   • 不同词被用于同一个 concept（synonyms）
   • 模糊或 overloaded terms
3. Propose a canonical glossary，对 term 选择保持 opinionated
4. Write to

   UBIQUITOUS_LANGUAGE.md

   ，在 working directory 中使用下面格式
5. Output a summary，在 conversation 中内联总结

Output Format

UBIQUITOUS_LANGUAGE.md

# Ubiquitous Language

## Order lifecycle

| Term        | Definition                                              | Aliases to avoid      |
| ----------- | ------------------------------------------------------- | --------------------- |
| **Order**   | A customer's request to purchase one or more items      | Purchase, transaction |
| **Invoice** | A request for payment sent to a customer after delivery | Bill, payment request |

## People

| Term         | Definition                                  | Aliases to avoid       |
| ------------ | ------------------------------------------- | ---------------------- |
| **Customer** | A person or organization that places orders | Client, buyer, account |
| **User**     | An authentication identity in the system    | Login, account         |

## Relationships

- An **Invoice** belongs to exactly one **Customer**
- An **Order** produces one or more **Invoices**

## Example dialogue

> **Dev:** "When a **Customer** places an **Order**, do we create the **Invoice** immediately?"
> **Domain expert:** "No — an **Invoice** is only generated once a **Fulfillment** is confirmed. A single **Order** can produce multiple **Invoices** if items ship in separate **Shipments**."
> **Dev:** "So if a **Shipment** is cancelled before dispatch, no **Invoice** exists for it?"
> **Domain expert:** "Exactly. The **Invoice** lifecycle is tied to the **Fulfillment**, not the **Order**."

## Flagged ambiguities

- "account" was used to mean both **Customer** and **User** — these are distinct concepts: a **Customer** places orders, while a **User** is an authentication identity that may or may not represent a **Customer**.

Rules

• Be opinionated. 同一概念有多个词时，选择最好的一个，并把其他列为 aliases to avoid。
• Flag conflicts explicitly. 如果 term 在 conversation 中被模糊使用，在 "Flagged ambiguities" section 中指出，并给出明确 recommendation。
• Only include terms relevant for domain experts. 除非 module 或 class 名在 domain language 中有意义，否则跳过。
• Keep definitions tight. 最多一句。定义它是什么，不定义它做什么。
• Show relationships. 使用粗体 term names，并在明显时表达 cardinality。
• Only include domain terms. 跳过 generic programming concepts（array、function、endpoint），除非它们有 domain-specific meaning。
• Group terms into multiple tables，当自然 clusters 出现时使用（例如按 subdomain、lifecycle 或 actor）。每组有自己的 heading 和 table。如果所有 terms 属于一个 cohesive domain，一个 table 就够，不要强行分组。
• Write an example dialogue. 写一段 dev 与 domain expert 之间的短对话（3-5 exchanges），展示 terms 如何自然互动。对话应澄清相关 concepts 的边界，并展示精确使用 terms。

Example dialogue

Dev: "How do I test the sync service without Docker?"

Domain expert: "Provide the filesystem layer instead of the Docker layer. It implements the same Sandbox service interface but uses a local directory as the sandbox."

Dev: "So sync-in still creates a bundle and unpacks it?"

Domain expert: "Exactly. The sync service doesn't know which layer it's talking to. It calls

exec

and

copyIn

— the filesystem layer just runs those as local shell commands."

Re-running

1. 读取已有

   UBIQUITOUS_LANGUAGE.md

2. 合并后续讨论中的新 terms
3. 如果理解演进，更新 definitions
4. 重新标记任何新 ambiguities
5. 重写 example dialogue 以纳入新 terms