This document proposes a Lightweight Data Markup Language (LDML) for representing structured information and relationships between data elements. It introduces the concept of "Sprache", which combines a formal language with defined ordering relations between statements. This allows scientific observations and properties to be rigorously related to one another. The LDML applies this idea by defining a grammar and set of relations to describe objects and data. This structured representation highlights gaps in knowledge and supports machine-guided investigation.