Function validate 

pub fn validate(path: PathBuf, level: String) -> Result<()>

Validate a 3MF file against the specification.

Performs semantic validation at the specified strictness level:

• minimal: Basic file integrity checks
• standard: Reference integrity and structure validation
• strict: Full spec compliance including unit consistency
• paranoid: Deep geometry analysis (manifoldness, self-intersection)

Arguments

• path - Path to the 3MF file
• level - Validation level string (minimal, standard, strict, paranoid)

Errors

Returns an error if validation fails (errors found) or the file cannot be parsed.

Exit Code

Exits with code 1 if validation errors are found, 0 if passed.