Pingmark defines a universal textual protocol for expressing spatial context through a minimal symbol: !@. Rather than embedding coordinates or using proprietary map links, Pingmark introduces a semantic trigger that compliant client applications interpret to generate a standardized resolver link of the form https://pingmark.me/lat/lon/[timestamp]. This allows location expression to function like existing textual conventions - @ for identity or # for topics - but for physical space. The protocol requires no user registration, relies on open mapping technologies, and protects privacy by generating location data ephemerally and locally. This paper presents the motivation, syntax, and design of the Pingmark Protocol Specification (PPS v0.1), its reference resolver implementation, and the long-term goal of establishing Pingmark as an open Internet standard for spatial mentions.

翻译：Pingmark定义了一种通用的文本协议，通过最小符号!@来表达空间上下文。该协议不嵌入坐标或使用专有地图链接，而是引入一个语义触发器，由兼容的客户端应用程序解释并生成标准化的解析器链接，其形式为https://pingmark.me/lat/lon/[timestamp]。这使得位置表达能够像现有的文本约定（如@用于身份标识、#用于主题标签）一样运作，但适用于物理空间。该协议无需用户注册，依赖开放地图技术，并通过在本地临时生成位置数据来保护隐私。本文介绍了Pingmark协议规范（PPS v0.1）的动机、语法和设计，其参考解析器实现，以及将Pingmark建立为空间提及的开放互联网标准的长期目标。