pub mod categories {
pub const DOCUMENT: &str = "document";
pub const CANONICAL_OBJECT_MODEL: &str = "canonicalObjectModel";
pub const STRUCTURAL: &str = "structural";
pub const GRAPH: &str = "graph";
pub const REFERENCE: &str = "reference";
pub const DATA_FLOW: &str = "dataFlow";
pub const CONTROL_FLOW: &str = "controlFlow";
pub const EXTENSION: &str = "extension";
}