[basex-talk] difference of type of $schema for different validation functions?

Why is the function https://docs.basex.org/main/Validation_Functions#validate:xsd documented as taking the schema as item()? while the function https://docs.basex.org/main/Validation_Functions#validate:xsd-report documents the schema as xs:string? ? Is that a documentation error or quirk or are these two functions taking different types of arguments for the schema?