Theodor H. Nelson, “As We Will Think." Proceedings of Online 72 Conference, Bruanel University, Uxbridge, England, 1972
What if the exact same information could live and breathe in multiple places? For example, if your company’s process for requesting time off changes, you’d probably have to find all the pages that mention the policy and manually update each of them.
Synced Blocks changes that. Instead of going through and updating the process to request time off in every page it’s referenced, turning it into a Synced Block allows you to update it once and have those changes reflected everywhere. Even though it’s a simple idea, it opens up many possibilities for how information can be structured and shared.
In computer science, transclusion is the inclusion of part or all of an electronic document into one or more other documents by hypertext reference. Transclusion is usually performed when the referencing document is displayed, and is normally automatic and transparent to the end user. The result of transclusion is a single integrated document made of parts assembled dynamically from separate sources, possibly stored on different computers in disparate places.
Transclusion facilitates modular design: a resource is stored once and distributed for reuse in multiple documents. Updates or corrections to a resource are then reflected in any referencing documents. Ted Nelson coined the term for his 1980 nonlinear book Literary Machines, but the idea of master copy and occurrences was applied 17 years before, in Sketchpad.