Version 1.3 introduces changes to help with [faster metadata reads and updates](https://blog.min.io/minio-versioning-metadata-deep-dive/)

| Entry           | Encoding                    | Content
| ----------------|-----------------------------|----------------------------------------
| xlHeaderVersion | msgp uint                   | header version identifier
| xlMetaVersion   | msgp uint                   | metadata version identifier

            if (node2.metadata == null) {
                return metadata == null;
            }

            return metadata != null && metadata.toString().equals(node2.metadata.toString());
        } else {
            return super.equals(obj);
        }
    }

    @Override
    public int hashCode() {
        if (metadata == null) {
            return super.hashCode();
        }

        if (exception != null) {
            msg = ": " + exception.getMessage();
        }

        if (logger.isDebugEnabled()) {
            logger.warn("The metadata {} {}{}", metadata, errorType, msg, exception);
        } else {
            logger.warn("The metadata {} {}{}", metadata, errorType, msg);
        }
    }

    @Override
    public void artifactDescriptorInvalid(RepositoryEvent event) {

        return path.toString();
    }

    private String path(Metadata metadata) {
        StringBuilder path = new StringBuilder(128);

        if (!metadata.getGroupId().isBlank()) {
            path.append(metadata.getGroupId().replace('.', '/')).append('/');
        }

        if (!metadata.getArtifactId().isBlank()) {
            path.append(metadata.getArtifactId()).append('/');
        }

### Internal metadata for replication

`xl.meta` that is in use for [versioning](https://github.com/minio/minio/blob/master/docs/bucket/versioning/DESIGN.md) has additional metadata for replication of objects,delete markers and versioned deletes.

		},
		// Empty header input returns empty metadata.
		{
			header:     nil,
			metadata:   nil,
			shouldFail: true,
		},
	}

	// Validate if the extracting headers.
	for i, testCase := range testCases {
		metadata := make(map[string]string)
		err := extractMetadataFromMime(t.Context(), textproto.MIMEHeader(testCase.header), metadata)
		if err != nil && !testCase.shouldFail {

import org.apache.maven.artifact.versioning.ArtifactVersion;
import org.apache.maven.repository.legacy.metadata.ArtifactMetadataRetrievalException;
import org.apache.maven.repository.legacy.metadata.ArtifactMetadataSource;
import org.apache.maven.repository.legacy.metadata.MetadataResolutionRequest;
import org.apache.maven.repository.legacy.metadata.ResolutionGroup;

@Named
@Singleton
@Deprecated

            <model>../../api/maven-api-metadata/src/main/mdo/metadata.mdo</model>
          </models>
          <params>
            <param>forcedIOModelVersion=1.1.0</param>
            <param>packageModelV3=org.apache.maven.artifact.repository.metadata</param>
            <param>packageModelV4=org.apache.maven.api.metadata</param>
            <param>packageToolV4=org.apache.maven.artifact.repository.metadata.io</param>
          </params>

import java.util.Objects;

import org.apache.maven.artifact.repository.metadata.Metadata;
import org.apache.maven.metadata.v4.MetadataStaxReader;

/**
 * Handles deserialization of metadata from some kind of textual format like XML.
 *
 */
@Named
@Singleton
public class DefaultMetadataReader implements MetadataReader {

    @Override
    public Metadata read(File input, Map<String, ?> options) throws IOException {

func TestGetObjectRetentionMeta(t *testing.T) {
	tests := []struct {
		metadata map[string]string
		expected ObjectRetention
	}{
		{
			metadata: map[string]string{
				"Authorization":        "AWS4-HMAC-SHA256 <cred_string>",
				"X-Amz-Content-Sha256": "",
				"Content-Encoding":     "",
			},
			expected: ObjectRetention{},
		},
		{
			metadata: map[string]string{
				"x-amz-object-lock-mode": "governance",
			},