Geo-X is based on GEO - available at: https://zenodo.org/records/8311214 - and represents a domain-independent evolution language for graph databases in general. To ensure adequate handling, accessing, evolving, and updating of heterogeneous data structures such as optional properties, it contains filter options. Due to the flexibility available in a schema-less graph database, classical schema evolution like in relational databases is not sufficient. In addition, constraint creation is guaranteed within the add operation. Geo-X aims to help users understand how schema evolution affects their database by describing what each operation does in a natural, EBNF-like syntax.