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: deserializers.go
    path of file: ./repos/aws-sdk-go-v2/service/iam
    
    the code of the file until where you have to start completion: // Code generated by smithy-go-codegen DO NOT EDIT.

package iam

import (
	"bytes"
	"context"
	"encoding/base64"
	"encoding/xml"
	"fmt"
	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
	awsxml "github.com/aws/aws-sdk-go-v2/aws/protocol/xml"
	"github.com/aws/aws-sdk-go-v2/service/iam/types"
	smithy "github.com/aws/smithy-go"
	smithyxml "github.com/aws/smithy-go/encoding/xml"
	smithyio "github.com/aws/smithy-go/io"
	"github.com/aws/smithy-go/middleware"
	"github.com/aws/smithy-go/ptr"
	smithytime "github.com/aws/smithy-go/time"
	smithyhttp "github.com/aws/smithy-go/transport/http"
	"io"
	"io/ioutil"
	"strconv"
	"strings"
)

type awsAwsquery_deserializeOpAddClientIDToOpenIDConnectProvider struct {
}

func (*awsAwsquery_deserializeOpAddClientIDToOpenIDConnectProvider) ID() string {
	return "OperationDeserializer"
}

func (m *awsAwsquery_deserializeOpAddClientIDToOpenIDConnectProvider) HandleDeserialize(ctx context.Context, in middleware.DeserializeInput, next middleware.DeserializeHandler) (
	out middleware.DeserializeOutput, metadata middleware.Metadata, err error,
) {
	out, metadata, err = next.HandleDeserialize(ctx, in)
	if err != nil {
		return out, metadata, err
	}

	response, ok := out.RawResponse.(*smithyhttp.Response)
	if !ok {
		return out, metadata, &smithy.DeserializationError{Err: fmt.Errorf("unknown transport type %T", out.RawResponse)}
	}

	if response.StatusCode < 200 || response.StatusCode >= 300 {
		return out, metadata, awsAwsquery_deserializeOpErrorAddClientIDToOpenIDConnectProvider(response, &metadata)
	}
	output := &AddClientIDToOpenIDConnectProviderOutput{}
	out.Result = output

	if _, err = io.Copy(ioutil.Discard, response.Body); err != nil {
		return out, metadata, &smithy.DeserializationError{
			Err: fmt.Errorf("failed to discard response body, %w", err),
		}
	}

	return out, meta
    
func awsAwsquery_deserializeDocumentPolicyGrantingServiceAccess(v **types.PolicyGrantingServiceAccess, decoder smithyxml.NodeDecoder) error {
	if v == nil {
		return fmt.Errorf("unexpected nil of type %T", v)
	}
	var sv *types.PolicyGrantingServiceAccess
	if *v == nil {
		sv = &types.PolicyGrantingServiceAccess{}
	} else {
		sv = *v
	}

	for {
		t, done, err := decoder.Token()
		if err != nil {
			return err
		}
		if done {
			break
		}
		originalDecoder := decoder
		decoder = smithyxml.WrapNodeDecoder(originalDecoder.Decoder, t)
		switch {
		case strings.EqualFold("EntityName", t.Name.Local):
			val, err := decoder.Value()
			if err != nil {
				return err
			}
			if val == nil {
				break
			}
			{
				xtv := string(val)
				sv.EntityName = ptr.String(xtv)
			}

		case strings.EqualFold("EntityType", t.Name.Local):
			val, err := decoder.Value()
			if err != nil {
				return err
			}
			if val == nil {
				break
			}
			{
				xtv := string(val)
				sv.EntityType = types.PolicyOwnerEntityType(xtv)
			}

		case strings.EqualFold("PolicyArn", t.Name.Local):
			val, err := decoder.Value()
			if err != nil {
				return err
			}
			if val == nil {
				break
			}
			{
				xtv := string(val)
				sv.PolicyArn = ptr.String(xtv)
			}

		case strings.EqualFold("PolicyName", t.Name.Local):
			val, err := decoder.Value()
			if err != nil {
				return err
			}
			if val == nil {
				break
			}
			{
				xtv := string(val)
				sv.PolicyName = ptr.String(xtv)
			}

		case strings.EqualFold("PolicyType", t.Name.Local):
			val, err := decoder.Value()
			if err != nil {
				return err
			}
			if val == nil {
				break
			}
			{
				xtv := string(val)
				sv.PolicyType = types.PolicyType(xtv)
			}

		default:
			// Do nothing and ignore the unexpected tag element
			err = decoder.Decoder.Skip()
			if err != nil {
				return err
			}

		}
		decoder = originalDecoder
	}
	*v = sv
	return nil
}