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: metadata.go
    path of file: ./repos/go-in-5-minutes/episode7/vendor/google.golang.org/appengine/datastore
    
    the code of the file until where you have to start completion: // Copyright 2016 Google Inc. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.

package datastore

import "golang.org/x/net/context"

// Datastore kinds for the metadata entities.
const (
	namespaceKind = "__namespace__"
	kindKind      = "__kind__"
	prope
    
func KindProperties(ctx context.Context, kind string) (map[string][]string, error) {
	// TODO(djd): Support range queries.
	kindKey := NewKey(ctx, kindKind, kind, 0, nil)
	q := NewQuery(propertyKind).Ancestor(kindKey)

	propMap := map[string][]string{}
	props := []struct {
		Repr []string `datastore:"property_representation"`
	}{}

	keys, err := q.GetAll(ctx, &props)
	if err != nil {
		return nil, err
	}
	for i, p := range props {
		propMap[keys[i].StringID()] = p.Repr
	}
	return propMap, nil
}