XML Extension Supplement
LEGAL ISSUES, COMPANY POLICIES AND STANDARDS
Web Services
A Web service is a software system designed to support interoperable machine-to-machine interaction over a network.
URI和URL
URI，全称是统一资源标识符（Uniform Resource Identifier），是一个用于标识某一互联网资源名称的字符串。这个字符串的格式由互联网标准RFC 3986定义。URI的目的是为了提供一种简单的方法来标识互联网上的资源。
URI的常见形式包括URL（统一资源定位符）和URN（统一资源名称）。
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URL是最常见的URI形式，它不仅标识资源，还提供了一个方法来定位和访问这个资源（例如：
https://www.example.com）。 -
URN则是资源的唯一名称，它与资源的位置无关（例如：
urn:isbn:0451450523，这是一个书籍的国际标准书号）。
JSON
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JSON (JavaScript Object Notation).
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Commonly used to create dynamic screen elements on websites, or transfer data over the web.
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The syntax is taken from JavaScript but JSON is portable with other languages.
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It is easy for humans to read and write.
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It is easy for machines to parse and generate.
JSON Types Examples
| Objects | {"key": "value"} |
|---|---|
| Arrays | [1, 2, 3] |
| String | "abc" |
| Numbers | 1 |
| Boolean | true false |
| Null | null |
JSON Pros and Cons
Pros:
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Very small
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Easy to parse
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Widely support
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Tightly integrated with JavaScript
Cons:
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Limited data types
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No comment syntax
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Not self describing
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No JSON schema*