Provides a simple structure to describe data models, functions to read data model from YAML file, and a function to create DiagrammeR graph objects:
datamodelr's data model object is a simple list of data frames which
represent the model entities and include elements and their relations.
See as.data_model.
Function dm_read_yaml reads YAML format and creates a
data model object.
Function dm_create_graph creates DiagrammeR graph object from
data model object.