Methods and systems for calculation of properties of objects/shapes across versions of applications

Systems and methods are disclosed in which a self-describing file is generated and utilized to provide applications with the ability to properly preserve unknown file content. A self-describing file may contain, or be associated with, an extension section that provides information that an application can use to properly calculate unknown file content. The extension section may include functions of formulas that the application can use to calculate values for data that the application would not otherwise support. This allows for the content of the self-describing file to be modified by an application that does not support all of the capabilities of the file while maintaining the integrity of the file and user experience when the file is subsequently accessed by a full featured application. 公开了其中生成并利用自描述文件来向应用提供适当地保留未知文件内容的能力的系统和方法。自描述文件可包含或关联于扩展部分，该扩展部分提供应用可用来适当地计算未知文件内容的信息。该扩展部分可包括应用可用来计算该应用原本将不会支持的数据的值的函数或公式。这允许自描述文件的内容被并非支持该文件的所有能力的应用修改，同时在全特征应用随后访问该文件时维护该文件的完整性和用户体验。