In a knowledge process, preserving a knowledge context is essential. To preserve a knowledge context, we need to transform relevant data or context of knowledge item in a standardized way. This paper suggests a meta model to preserve knowledge context in a virtual workspace. With this XML based meta model, we can annotate a document or knowledge that describe the knowledge item abstractly and synthetically according to predefined schema. This meta data can be applied to knowledge searching, help users to understand retrieved knowledge more clearly, provide more relevant documents by specific situations and suggest further navigation path of knowledge.