Type Alias Headers 

pub type Headers = HashMap<String, usize>;

A map from <th> table headers to their zero-based positions.

For example, consider the following table:

<table>
    <tr><th>Name</th><th>Age</th></tr>
    <tr><td>John</td><td>20</td></tr>
</table>

The Headers for this table would map “Name” to 0 and “Age” to 1.

Aliased Type

pub struct Headers { /* private fields */ }