def is_structure(structure):
    """Check if an object is a stucture that javelin can understand.

    ase.atoms with have cell, get_scaled_positions and get_atomic_numbers attributes
    diffpy.structure with have lattice, xyz, and element attributes
    """
    return (hasattr(structure, 'cell') or hasattr(structure, 'unitcell')
        ) and hasattr(structure, 'get_scaled_positions') and hasattr(structure,
        'get_atomic_numbers') or hasattr(structure, 'lattice') and hasattr(
        structure, 'xyz') and hasattr(structure, 'element')
