You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: map.go
    path of file: ./repos/ko/vendor/github.com/aws/aws-sdk-go-v2/aws/protocol/query
    
    the code of the file until where you have to start completion: package query

import (
	"fmt"
	"net/url"
)

// Map represents the encoding of Query maps. A Query map is a representation
// of a mapp
    
func (m *Map) Key(name string) Value {
	// Query lists start a 1, so adjust the size first
	m.size++
	var key string
	var value string
	if m.flat {
		key = fmt.Sprintf("%s.%d.%s", m.prefix, m.size, m.keyLocationName)
		value = fmt.Sprintf("%s.%d.%s", m.prefix, m.size, m.valueLocationName)
	} else {
		key = fmt.Sprintf("%s.entry.%d.%s", m.prefix, m.size, m.keyLocationName)
		value = fmt.Sprintf("%s.entry.%d.%s", m.prefix, m.size, m.valueLocationName)
	}

	// The key can only be a string, so we just go ahead and set it here
	newValue(m.values, key, false).String(name)

	// Maps can't have flat members
	return newValue(m.values, value, false)
}