title: Modeling Tool for NOSQL Databases
body: <p>I know that most of the time NOSQL databses are schema-less or at least have a flexible database schema.
  However, the basic schema needs to be modeled beforehand and may evolve later. So,in this case,  is there a modeling tool/language for NOSQL databases? 
  Like UML for RDB and Visual Paradigm (UML modeling tool). I found that for "Graph Databases", we can use "Property Graph Model" but I am working on "BigColumn Databases" and "Document-base Databases".
  Thank you.</p>