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// Copyright 2025 Google LLC
// SPDX-License-Identifier: Apache-2.0
/// A parsed representation of a [MARC 21 record leader][leader].
///
/// A MARC leader contains metadata that dictates how to interpret the rest  
/// of the record.
///
/// [leader]: https://www.loc.gov/marc/bibliographic/bdleader.html
pub struct Leader {
    /// Determines the schema and the set of valid subsequent data fields.  
    ///
    /// Encoded in byte 6 of the leader.  
    pub type_of_record: char,

    /// Indicates whether to parse relationship fields, such as a "773 Host  
    /// Item Entry" for an article within a larger work.  
    ///  
    /// Encoded in byte 7 of the leader.  
    pub bibliographic_level: char,
    // ... 其他字段
}

/// Parses the [leader of a MARC 21 record][leader].
///  
/// The leader is encoded as a fixed-length 24-byte field, containing metadata  
/// that determines the semantic interpretation of the rest of the record.  
/// 
/// [leader]: https://www.loc.gov/marc/bibliographic/bdleader.html
pub fn parse_leader(leader_bytes: &[u8; 24]) -> Result<Leader, MarcError> {
    todo!()
}

#[derive(Debug)]
pub enum MarcError {}