A wrapper, in data mining, is a method that extracts structured information from unstructured sources, converting it into a relational format for analysis. This concept, however, goes beyond technical applications, as writers have long used the metaphor of "wrapper" to describe layers surrounding objects or ideas. For instance, Thomas Hardy portrays a character’s rough, weatherworn wrapper as a symbol of rural simplicity, while Hector France contrasts elaborate packaging with its often-spoiled contents, emphasizing the duality of form and substance.
Robert F. Salade’s detailed descriptions of paper wrappers in manufacturing further demonstrate how the term includes both functional and aesthetic aspects, ranging from protective coverings to decorative features. These diverse viewpoints highlight the wrapper’s role as both a technical instrument and a multifaceted metaphor across various fields.