"""
Annotation conversion utilities (GTF/GFF format conversions).
"""


def convert_gff_to_gtf(gff_file, gtf_file):
    """
    Convert GFF format annotation file to GTF format.
    
    Parameters
    ----------
    gff_file : str
        Path to input GFF file.
    gtf_file : str
        Path to output GTF file.
    
    Returns
    -------
    None
    
    Notes
    -----
    This function handles GFF3 to GTF format conversion, standardizing
    the attribute column format and adjusting coordinate systems as needed.
    """
    # Placeholder implementation
    pass


def convert_gtf_to_gff(gtf_file, gff_file):
    """
    Convert GTF format annotation file to GFF3 format.
    
    Parameters
    ----------
    gtf_file : str
        Path to input GTF file.
    gff_file : str
        Path to output GFF3 file.
    
    Returns
    -------
    None
    
    Notes
    -----
    This function handles GTF to GFF3 format conversion, standardizing
    the attribute column format.
    """
    # Placeholder implementation
    pass


def parse_gtf_attributes(attribute_string):
    """
    Parse GTF/GFF attribute column into a dictionary.
    
    Parameters
    ----------
    attribute_string : str
        The attribute column from a GTF/GFF file.
    
    Returns
    -------
    dict
        Parsed attributes as key-value pairs.
    """
    # Placeholder implementation
    return {}
