// Entity stuff, e.g., in case of m being a Matrix:
begin( m, tag::addressing_index<1>() )  // Row iterator, only dense types supported at the moment
begin( m, tag::addressing_index<2>() )  // Column iterator
begin( m, tag::row() )            // Same as <1>
begin( m, tag::column() )         // Same as <2>
begin( m, tag::major() )          // Depends on data_order
begin( m, tag::minor() )          // Depends on data_order

begin( m, tag::index_major() )            // Sparse matrices
begin( m, tag::index_minor() )            // Sparse matrices
begin( m, tag::compressed_index_major() ) // Sparse matrices

// Data stuff, e.g.,:
begin( m, tag::value() )          // Begin of value array or main diagonal

// Convenience
begin1(m)                       // Convenience for tagged version
begin2(m)                       // Convenience for tagged version
begin_row(m)                    // Convenience for tagged version
begin_column(m)                 // Convenience for tagged version
begin_major(m)                  // Convenience for tagged version
begin_minor(m)                  // Convenience for tagged version

begin_index_major(m)            // Convenience for tagged version
begin_index_minor(m)            // Convenience for tagged version
begin_compressed_index_major(m) // Convenience for tagged version

begin_value(m)                  // Convenience for tagged version