<img src="/img/tutorial/path-operation-configuration/image01.png">

### Tags with Enums

If you have a big application, you might end up accumulating **several tags**, and you would want to make sure you always use the **same tag** for related *path operations*.

In these cases, it could make sense to store the tags in an `Enum`.

**FastAPI** supports that the same way as with plain strings:

			}
			traceFn := globalLifecycleSys.trace(oi)
			// Note: NewerNoncurrentVersions action is performed only scanner today
			tags := newLifecycleAuditEvent(lcEventSrc_Scanner, lcEvent).Tags()

			// Send audit for the lifecycle delete operation
			auditLogLifecycle(
				ctx,
				oi,
				ILMExpiry, tags, traceFn)

			evArgs := eventArgs{
				EventName:  event.ObjectRemovedDelete,
				BucketName: bucket,

    }

    val sink = sink()

    // Write the tagClass, tag, and constructed bit. This takes 1 byte if tag is less than 31.
    if (tag < 31) {
      val byte0 = tagClass or constructedBit or tag.toInt()
      sink.writeByte(byte0)
    } else {
      val byte0 = tagClass or constructedBit or 0b0001_1111
      sink.writeByte(byte0)
      writeVariableLengthLong(tag)
    }

        final Object tagsObj = existingSource.get(FieldNames.TAGS);
        if (tagsObj instanceof List) {
            @SuppressWarnings("unchecked")
            final List<String> existingValues = (List<String>) tagsObj;
            concatValues(existingValues, tags);
            map.put(FieldNames.TAGS, existingValues);
        } else {
            map.put(FieldNames.TAGS, tags);
        }

        queryBuilder.must(QueryBuilders.rangeQuery(FieldNames.QUERY_FREQ).gte(queryFreqThreshold));
        if (!tags.isEmpty()) {
            queryBuilder.must(QueryBuilders.termsQuery(FieldNames.TAGS, tags));
        }
        if (!roles.isEmpty()) {
            queryBuilder.must(QueryBuilders.termsQuery(FieldNames.ROLES, roles));
        } else {

		},
		{
			inputXML: `<Rule>
				<ID>Rule with multiple tags and DelMarkerExpiration</ID>
				<Filter><And>
				<Tag><Key>k1</Key><Value>v1</Value></Tag>
				<Tag><Key>k2</Key><Value>v2</Value></Tag>
				</And></Filter>
				<DelMarkerExpiration>
					<Days>365</Days>
				</DelMarkerExpiration>
                            <Status>Enabled</Status>
	                    </Rule>`,

    - **name**: each item must have a name
    - **description**: a long description
    - **price**: required
    - **tax**: if the item doesn't have tax, you can omit this
    - **tags**: a set of unique tag strings for this item
    """

		}

		if len(r.Flags.Filter.Tags) > 0 {
			// Only parse object tags if tags filter is specified.
			tagMap := map[string]string{}
			tagStr := info.Metadata[xhttp.AmzObjectTagging]
			if len(tagStr) != 0 {
				t, err := tags.ParseObjectTags(tagStr)
				if err != nil {
					return false
				}
				tagMap = t.ToMap()
			}

			for _, kv := range r.Flags.Filter.Tags {
				for t, v := range tagMap {

### Add some custom `tags`, `responses`, and `dependencies`

We are not adding the prefix `/items` nor the `tags=["items"]` to each *path operation* because we added them to the `APIRouter`.

But we can still add _more_ `tags` that will be applied to a specific *path operation*, and also some extra `responses` specific to that *path operation*:

	// for more detail.
	tags = append(tags, context.GOOS, context.GOARCH)
	sort.Strings(tags)

	for _, tag := range tags {
		if ctags[tag] {
			key += "," + tag
			ctags[tag] = false
		}
	}
	return key
}

type listImports struct {
	stdPackages []string                     // names, omitting "unsafe", internal, and vendored packages