NameComponentType » History » Revision 19
Revision 18 (Davide Pesavento, 06/28/2020 02:19 PM) → Revision 19/29 (Alex Afanasyev, 10/26/2021 02:00 PM)
# Name Component Type Assignment
This document lists the assigned Name Component types as well as the reserves ranges of types for experimentation purposes.
## Assigned types
Component Type | TLV-TYPE | TLV-VALUE Format | Description | Alternate URI Format | Reference
-------------------------------------|--------------|--------------------|---------------------------------------|-----------------------|----------
Invalid | 0 (0x00) | N/A | Invalid name component type | N/A | [NDN packet spec](https://named-data.net/doc/NDN-packet-spec/current/name.html)
ImplicitSha256DigestComponent | 1 (0x01) | 32OCTET | Implicit SHA-256 digest component | `sha256digest=<hex>` | [NDN packet spec](https://named-data.net/doc/NDN-packet-spec/current/name.html)
ParametersSha256DigestComponent | 2 (0x02) | 32OCTET | SHA-256 digest of Interest Parameters | `params-sha256=<hex>` | [NDN packet spec](https://named-data.net/doc/NDN-packet-spec/current/name.html)
GenericNameComponent | 8 (0x08) | *OCTET | Generic name component | "`8=`" prefix omitted | [NDN packet spec](https://named-data.net/doc/NDN-packet-spec/current/name.html)
KeywordNameComponent | 32 (0x20) | *OCTET | Well-known keyword | (not defined) |
SegmentNameComponent | 33 (0x21) | NonNegativeInteger | Segment number | `seg=<dec>` | [NDN naming conventions](https://named-data.net/publications/techreports/ndn-tr-22-2-ndn-memo-naming-conventions/)
ByteOffsetNameComponent | 34 (0x22) | NonNegativeInteger | Byte offset | `off=<dec>` | [NDN naming conventions](https://named-data.net/publications/techreports/ndn-tr-22-2-ndn-memo-naming-conventions/)
VersionNameComponent | 35 (0x23) | NonNegativeInteger | Version number | `v=<dec>` | [NDN naming conventions](https://named-data.net/publications/techreports/ndn-tr-22-2-ndn-memo-naming-conventions/)
TimestampNameComponent | 36 (0x24) | NonNegativeInteger | Unix timestamp in microseconds | `t=<dec>` | [NDN naming conventions](https://named-data.net/publications/techreports/ndn-tr-22-2-ndn-memo-naming-conventions/)
SequenceNumNameComponent | 37 (0x25) | NonNegativeInteger | Sequence number | `seq=<dec>` | [NDN naming conventions](https://named-data.net/publications/techreports/ndn-tr-22-2-ndn-memo-naming-conventions/)
## Reserved ranges
The reserved ranges are superset of TLV code reservations of the [NDN packet specification](https://named-data.net/doc/NDN-packet-spec/current/types.html#tlv-type-number-reservations) with the following additions:
TBD
Type (dec) | Description
------------|---------------------------------------
3-7, 9-31 | Reserved
38-200 | Unassigned (1-byte encoding)
201-252 | For experimental use (1-byte encoding)
253-3200 | Unassigned (3-byte encoding)
3201-65535 | For experimental use (3-byte encoding)
65536+ | Invalid values (5+-byte encoding)
## References
https://named-data.net/doc/NDN-packet-spec/current/name.html