本文档指定了从任何XSD模式到抽象语法符号One（ASN.1）模式的映射的两个版本。ASN。1两个版本的模式都支持相同的语义，并验证相同的XML文档集。 本文件规定了最终的XER编码指令，这些指令将作为已定义的ASN映射的一部分应用。1类型，但未指定用于指定这些最终XER编码指令的语法形式，或其赋值顺序或方式。 注意——生成这些映射的工具的实现者可以选择任何语法形式或赋值顺序，从而应用指定的最终XER编码指令。本文中的示例通常使用类型前缀形式，但出于风格的考虑，对于完整XSD模式的映射，使用XER编码控制部分可能是首选。 有不同的方式（从语法上）分配XER编码指令，以用于扩展语言- XER编码（例如，使用ASN.1类型前缀编码指令或使用XER编码控制部分）。这些句法形式的选择是风格问题，不在本文件的范围之内。

This document specifies two versions of a mapping from any XSD Schema into an Abstract Syntax Notation One (ASN.1) schema. The ASN.1 schema for both versions support the same semantics and validate the same set of XML documents. This document specifies the final XER encoding instructions that are to be applied as part of the defined mapping to ASN.1 types, but does not specify which syntactic form is to be used for the specification of those final XER encoding instructions, or the order or manner of their assignment. NOTE – Implementers of tools generating these mappings may choose any syntactic form or order of assignment that results in the specified final XER encoding instructions being applied. Examples in this document generally use the type prefix form, but use of an XER Encoding Control Section may be preferred for the mapping of a complete XSD Schema, as a matter of style. There are different ways (syntactically) of assigning XER encoding instructions for use in EXTENDED-XER encodings (e.g., use of ASN.1 type prefix encoding instructions or use of an XER encoding control section). The choice of these syntactic forms is a matter of style and lies outside the scope of this document.