From 11622f335a2dd59acf313aa0e19fb700c27fb423 Mon Sep 17 00:00:00 2001 From: jonnycrunch Date: Tue, 1 Dec 2020 12:48:11 -0600 Subject: [PATCH] Update CBOR section of specification. --- index.html | 486 ++++++++++++++++++++++++----------------------------- 1 file changed, 215 insertions(+), 271 deletions(-) diff --git a/index.html b/index.html index 9f56d786..84f113a9 100644 --- a/index.html +++ b/index.html @@ -134,13 +134,6 @@ company: "Danube Tech", companyURL: "https://danubetech.com/", w3cid: 46729 - }, - { - name: "Jonathan Holt, DO, MS", - url: "https://www.linkedin.com/in/jonathan-holt-do-ms", - company: "ConsenSys Health", - companyURL: "https://www.consensyshealth.com", - w3cid: 95341 } ] }; @@ -2811,179 +2804,118 @@

CBOR

Representation (CBOR) [[RFC7049]] defines a set of formatting rules for the portable representation of structured data. CBOR is a more concise, machine-readable, language-independent data interchange format that is -self-describing and has built-in semantics for interoperability. With specific -constraints, CBOR can support all JSON data types (including JSON-LD) for +self-describing and has built-in semantics for interoperability. CBOR prioritizes +the simplicity of the encoder and decoder over the size of the encoded data. +With specific constraints, CBOR can support all JSON data types for translation between the DID document model (described in Data Model and DID Documents) and other core -representations. -

- -

-Concise Data Definition Language (CDDL) [[RFC8610]] is a notation used to -express Concise Binary Object Representation (CBOR), and by extension JSON Data -Structures. The following notation expresses the DID Document model in CBOR -representation with specific constraints for deterministic mappings between -other core representations. +href="#data-model">Data Model and the Core Properties section of the DID Document).

- 
-DID-document = {
-  ? @context : uri
-  id : did
-  ? publicKey : [* publicKey ]
-  ? authentication :  [ *did // *publicKey // *tstr ]
-  ? service : [ + service  ]
-  ? controller : did / [ *did ]
-  ? created : time
-  ? updated : time
-  proof :  any
-}
-
-publicKey = {
-  id : did
-  type : text
-  controller : uri
-}
+

+When producing and consuming DID documents that are encoded in CBOR (as indicated 
+by a content-type of application/did+cbor in the resolver metadata), the following rules MUST be followed.
+

+      
+      

+        
Production

+        

+A DID document encoded in CBOR must be represented as a CBOR Map (major type 5) conforming to [[RFC7049]]. 
+Similar to the JSON encoding of a DID document, all properties of the DID document MUST be represented by using the 
+property name as the name of the member of the CBOR map.  The values of properties of the data model described in  § 5. Core Properties, including 
+all extensions, MUST be encoded in CBOR [[RFC7049]] by mapping INFRA property values to CBOR types as follows: 

+
+
+
+
+
+  

+  To produce a deterministic canonical CBOR representation of a DID document and faciliate maximal lossless compatiblity with other 
+  core representations via the Abstract Data Model the following constraints of a CBOR representation of a DID Document model MUST be followed:
+ 
+
    
+    
  • Property names MUST be represented as text string (major type 3) and contain only UTF-8 strings. 
    • 
+    
  • Undefined Values of Required Properties as defined in the Data Model that are absent from the CBOR representation SHOULD be labeled with Primitive type (major type 7) with value 23 (Undefined value).  
    • 
+    
  • Property names in each CBOR map MUST be unique. 
    • 
+    
  • Integer encoding MUST be as short as possible.
    • 
+    
  • The expression of lengths in CBOR major types 2 through 5 MUST be as short as possible. 
    • 
+    
  • The keys in every map must be sorted lowest value to highest. Sorting is performed on the bytes of the representation of the keys. If two keys have different lengths, the shorter one sorts earlier.  If two keys have the same length, the one with the lower value in (byte-wise) lexical order sorts earlier. 
    • 
+  

+

 
-did = tstr .pcre "^did\\:(?<method-name>[a-z0-9]{2,})\\:(?<method-specific-id>[A-Za-z0-9\\.\\-\\:\\_]+)"
 
-did-url =  tstr .pcre "^did\\:(?<method-name>[a-z0-9]{2,})\\:(?<method-specific-id>[A-Za-z0-9\\.\\-\\:\\_]+)\\;(?<path>[A-Za-z0-9\\/)(?<query>\\?[a-z0-9\\=\\&])#(?<fragment>.+)"
+

+ How to represent Floating-point values that can exceed the range or the precision IEEE 754. See issue #361. 
+

 
-service = {
-  id : did-url
-  type : text
-  serviceEndpoint : uri
-  ? description : text
-  * tstr => any
-}
-
+

+ The property name `@context` MAY be present in the CBOR representation of a DID Document and if present SHOULD be ignored as this property is reserved for JSON-LD processing. +

-
-

Production

-

-When producing DID Documents that are represented as CBOR, in addition to the -suggestions in section 3.9 of the CBOR [[RFC7049]] specification for -deterministic mappings, the following constraints of the DID Document model -MUST be followed: -

+

+ All properties of the DID document represented in CBOR MUST be included in the root map (major type 5). + Properties MAY define additional data sub structures represented as nested CBOR maps (major type 5) + and is subject to the value representation rules in the lists above and conformance to section § 4.3 Extensibility. +

- +

+

- 
-    a7                                                # map(7)
-    62                                                #   text(2)
-       6964                                           #     "id"
-    78 40                                             #   text(64)
-       6469643a6578616d706c653a31324433               #     "did:example:12D3"
-       4b6f6f574d4864727a6377706a626472               #     "KooWMHdrzcwpjbdr"
-       5a733547477145524176636771583362               #     "Zs5GGqERAvcgqX3b"
-       3564707550745061396f743639796577               #     "5dpuPtPa9ot69yew"
-    65                                                #   text(5)
-       70726f6f66                                     #     "proof"
-    a4                                                #   map(4)
-       64                                             #     text(4)
-          74797065                                    #       "type"
-       74                                             #     text(20)
-          656432353531395369676e617475726532303138    #       "ed25519Signature2018"
-       67                                             #     text(7)
-          63726561746564                              #       "created"
-       74                                             #     text(20)
-          323032302d30352d30315430333a30303a30325a    #       "2020-05-01T03:00:02Z"
-       67                                             #     text(7)
-          63726561746f72                              #       "creator"
-       78 8c                                          #     text(140)
-          6469643a6578616d706c653a31324433            #       "did:example:12D3"
-          4b6f6f574d4864727a6377706a626472            #       "KooWMHdrzcwpjbdr"
-          5a733547477145524176636771583362            #       "Zs5GGqERAvcgqX3b"
-          3564707550745061396f743639796577            #       "5dpuPtPa9ot69yew"
-          3b206578616d706c653a6b65793d6964            #       "; example:key=id"
-          3d626166797265696375627478357771            #       "=bafyreicubtx5wq"
-          6f336e6f73633463617a726b63746668            #       "o3nosc4cazrkctfh"
-          776436726577657a6770776f65347377            #       "wd6rewezgpwoe4sw"
-          69726c733465626468733269                    #       "irls4ebdhs2i"
-       6e                                             #     text(14)
-          7369676e617475726556616c7565                #       "signatureValue"
-       78 58                                          #     text(88)
-          6f3972364c78676f474e38466f616565            #       "o9r6LxgoGN8Foaee"
-          554136456444637631324776447a4645            #       "UA6EdDcv12GvDzFE"
-          6d43676a577a76707572325953517941            #       "mCgjWzvpur2YSQyA"
-          3857327230535357554b2b6e4835744d            #       "8W2r0SSWUK+nH5tM"
-          717a61464c756e3677775a31456f7433            #       "qzaFLun6wwZ1Eot3"
-          37616d4744673d3d                            #       "7amGDg=="
-    67                                                #   text(7)
-       63726561746564                                 #     "created"
-    74                                                #   text(20)
-       323031382d31322d30315430333a30303a30305a       #     "2018-12-01T03:00:00Z"
-    67                                                #   text(7)
-       75706461746564                                 #     "updated"
-    74                                                #   text(20)
-       323032302d30352d30315430333a30303a30305a       #     "2020-05-01T03:00:00Z"
-    68                                                #   text(8)
-       40636f6e74657874                               #     "@context"
-    78 1c                                             #   text(28)
-       68747470733a2f2f7777772e77332e6f               #     "https://www.w3.o"
-       72672f6e732f6469642f7631                       #     "rg/ns/did/v1"
-    69                                                #   text(9)
-       7075626c69634b6579                             #     "verificationMethod"
-    81                                                #   array(1)
-       a5                                             #     map(5)
-          62                                          #       text(2)
-             6964                                     #         "id"
-          78 85                                       #       text(133)
-             6261667972656963756274783577716f         #         "bafyreicubtx5wqo"
-             336e6f73633463617a726b6374666877         #         "3nosc4cazrkctfhw"
-             6436726577657a6770776f6534737769         #         "d6rewezgpwoe4swi"
-             726c7334656264687332693b6578616d         #         "rls4ebdhs2i;exam"
-             706c653a6b65793d6964626166797265         #         "ple:key=idbafyre"
-             6963756274783577716f336e6f736334         #         "icubtx5wqo3nosc4"
-             63617a726b6374666877643672657765         #         "cazrkctfhwd6rewe"
-             7a6770776f6534737769726c73346562         #         "zgpwoe4swirls4eb"
-             6468733269                               #         "dhs2i"
-          64                                          #       text(4)
-             74797065                                 #         "type"
-          6e                                          #       text(14)
-             45644473615075626c69634b6579             #         "EdDsaPublicKey"
-          65                                          #       text(5)
-             6375727665                               #         "curve"
-          67                                          #       text(7)
-             65643235353139                           #         "ed25519"
-          67                                          #       text(7)
-             65787069726573                           #         "expires"
-          74                                          #       text(20)
-             323031392d31322d30315430333a30303a30305a #         "2019-12-01T03:00:00Z"
-          6f                                          #       text(15)
-             7075626c69634b6579426173653634           #         "publicKeyBase64"
-          78 2c                                       #       text(44)
-             716d7a3774704c4e4b4b4b646c376344         #         "qmz7tpLNKKKdl7cD"
-             375062656a4469425670374f4e706d5a         #         "7PbejDiBVp7ONpmZ"
-             62666d633763454b396d673d                 #         "bfmc7cEK9mg="
-    6e                                                #   text(14)
-       61757468656e7469636174696f6e                   #     "authentication"
-    81                                                #   array(1)
-       78 83                                          #     text(131)
-          6469643a6578616d706c653a31324433            #       "did:example:12D3"
-          4b6f6f574d4864727a6377706a626472            #       "KooWMHdrzcwpjbdr"
-          5a733547477145524176636771583362            #       "Zs5GGqERAvcgqX3b"
-          3564707550745061396f743639796577            #       "5dpuPtPa9ot69yew"
-          3b6b65792d69643d6261667972656963            #       ";key-id=bafyreic"
-          756274783577716f336e6f7363346361            #       "ubtx5wqo3nosc4ca"
-          7a726b63746668776436726577657a67            #       "zrkctfhwd6rewezg"
-          70776f6534737769726c733465626468            #       "pwoe4swirls4ebdh"
-          733269                                      #       "s2i"
+  
    
+  

+
+
+
+  A2626964781E6469643A6578616D706C653A313233343536373839616263
+  6465666768696E61757468656E7469636174696F6E81A462696478256469
+  643A6578616D706C653A313233343536373839616263646566676869236B
+  6579732D316474797065781A45643235353139566572696669636174696F
+  6E4B6579323031386A636F6E74726F6C6C6572781E6469643A6578616D70
+  6C653A3132333435363738396162636465666768696F7075626C69634B65
+  79426173653538782C483343324156764C4D7636676D4D4E616D33755641
+  6A5A70666B634A437744776E5A6E367A3377586D715056
+

+  
+
  
+A2                                   # map(2)
+62                                   # text(2)
+   6964                              # "id"
+78 1E                                # text(30)
+   6469643A6578616D706C653A313233343536373839616263646566676869 # "did:example:123456789abcdefghi"
+6E                                   # text(14)
+   61757468656E7469636174696F6E      # "authentication"
+81                                   # array(1)
+   A4                                # map(4)
+      62                             # text(2)
+         6964                        # "id"
+      78 25                          # text(37)
+         6469643A6578616D706C653A313233343536373839616263646566676869236B6579732D31 # "did:example:123456789abcdefghi#keys-1"
+      64                             # text(4)
+         74797065                    # "type"
+      78 1A                          # text(26)
+         45643235353139566572696669636174696F6E4B657932303138 # "Ed25519VerificationKey2018"
+      6A                             # text(10)
+         636F6E74726F6C6C6572        # "controller"
+      78 1E                          # text(30)
+         6469643A6578616D706C653A313233343536373839616263646566676869 # "did:example:123456789abcdefghi"
+      6F                             # text(15)
+         7075626C69634B6579426173653538 # "publicKeyBase58"
+      78 2C                          # text(44)
+         483343324156764C4D7636676D4D4E616D337556416A5A70666B634A437744776E5A6E367A3377586D715056 # "H3C2AVvLMv6gmMNam3uVAjZpfkcJCwDwnZn6z3wXmqPV"
@@ -2991,21 +2923,29 @@

Production

Consumption

-When consuming DID Documents that are represented as CBOR, in addition to the -suggestions in section 3.9 of the CBOR [[RFC7049]] specification for -deterministic mappings the following constraints of the DID Document model MUST -be followed: -

- -
+ When consuming DID Documents that are represented as CBOR and interpreting the data types with respect to the Abstract Data Model using INFRA types the following consumption rules MUST be followed: +

+ + + + +

Additional Considerations:

+ + +

CBOR Extensibility

@@ -3013,14 +2953,31 @@

CBOR Extensibility

In CBOR, one point of extensibility is with the use of CBOR tags. [[RFC7049]] defines a basic set of data types, as well as a tagging mechanism that enables extending the set of data types supported via the CBOR Tag +href="https://www.iana.org/assignments/cbor-tags/cbor-tags.xhtml">IANA CBOR Tag Registry. This allows for tags to enhance the semantic description of the -data that follows. -

+data that follows. Extensibility with CBOR tags also facilitates lossless conversion to +othere core representations. CBOR Tags number 21 to 23 indicate that a following byte string +might require a specific encoding when interoperating with a text-based +representation such as JSON. These tags are useful when an encoder knows that the +byte string data it is writing is likely to be later converted to a +particular text-based usage such as JSON. These three tag numbers suggest conversions to three of the base data +encodings defined in [[RFC4648]]. Tag number 21 suggests conversion to +base64url encoding (Section 5 of [[RFC4648]]), where padding is not used +(see Section 3.2 of [[RFC4648]]); that is, all trailing equals signs +("=") are removed from the encoded string. Tag number 22 suggests +conversion to classical base64 encoding (Section 4 of [[RFC4648]] ), with +padding as defined in [[RFC4648]]. For both base64url and base64, +padding bits are set to zero (see Section 3.5 of [[RFC4648]] ), and +encoding is performed without the inclusion of any line breaks, +whitespace, or other additional characters. Tag number 23 suggests +conversion to base16 (hex) encoding, with uppercase alphabetics (see +Section 8 of [[RFC4648]]). Note that, for all three tag numbers, the +encoding of the empty byte string is the empty text string of other representations. +

-
-

DagCBOR

-

+

+

DagCBOR

+

DagCBOR is a further restricted subset of CBOR for representing the DID Document as a Directed Acyclic Graph model using canonical CBOR encoding as noted above with additional constraints. DagCBOR requires that there exist a single way of @@ -3036,88 +2993,75 @@

DagCBOR

- 
-{ "@context": "https://www.w3.org/ns/did/v1",
-  "authentication": [
-    "did:example:12D3KooWMHdrzcwpjbdrZs5GGqERAvcgqX3b5dpuPtPa9ot69yew;key-id=bafyreicubtx5wqo3nosc4cazrkctfhwd6rewezgpwoe4swirls4ebdhs2i"
-  ],
-  "created": "2018-12-01T03:00:00Z",
-  "id": "did:example:12D3KooWMHdrzcwpjbdrZs5GGqERAvcgqX3b5dpuPtPa9ot69yew",
-  "verificationMethod": [
-    {
-      "curve": "ed25519",
-      "expires": "2019-12-01T03:00:00Z",
-      "id": "bafyreicubtx5wqo3nosc4cazrkctfhwd6rewezgpwoe4swirls4ebdhs2i;example:key=idbafyreicubtx5wqo3nosc4cazrkctfhwd6rewezgpwoe4swirls4ebdhs2i",
-      "publicKeyBase64": "qmz7tpLNKKKdl7cD7PbejDiBVp7ONpmZbfmc7cEK9mg=",
-      "type": "EdDsaPublicKey"
-    }
-  ],
-  "updated": "2020-05-01T03:00:00Z"
-}
-
+ 
+            a5                                      # map(5)
+            62                                   # text(2)
+               6964                              # "id"
+            78 40                                # text(64)
+               6469643a6578616d706c653a313244334b6f6f574d4864727a6377706a6264725a7335474771455241766367715833623564707550745061396f743639796577 # "did:example:12D3KooWMHdrzcwpjbdrZs5GGqERAvcgqX3b5dpuPtPa9ot69yew"
+            65                                   # text(5)
+               70726f6f66                        # "proof"
+            d8 2a                                # tag(42)
+               58 26                             # bytes(38)
+                  000190011b20a7f3a13d0dafa9b8b640fee52173c27b9a66ff27f6669b3be73fc0ee6849e2ce # "\x00\x01\x90\x01\e \xA7\xF3\xA1=\r\xAF\xA9\xB8\xB6@\xFE\xE5!s\xC2{\x9Af\xFF'\xF6f\x9B;\xE7?\xC0\xEEhI\xE2\xCE"
+            68                                   # text(8)
+               40636f6e74657874                  # "@context"
+            78 1c                                # text(28)
+               68747470733a2f2f7777772e77332e6f72672f6e732f6469642f7631 # "https://www.w3.org/ns/did/v1"
+            6e                                   # text(14)
+               61757468656e7469636174696f6e      # "authentication"
+            81                                   # array(1)
+               78 83                             # text(131)
+                  6469643a6578616d706c653a313244334b6f6f574d4864727a6377706a6264725a7335474771455241766367715833623564707550745061396f7436397965773b6b65792d69643d6261667972656963756274783577716f336e6f73633463617a726b63746668776436726577657a6770776f6534737769726c733465626468733269 # "did:example:12D3KooWMHdrzcwpjbdrZs5GGqERAvcgqX3b5dpuPtPa9ot69yew;key-id=bafyreicubtx5wqo3nosc4cazrkctfhwd6rewezgpwoe4swirls4ebdhs2i"
+            72                                   # text(18)
+               766572696669636174696f6e4d6574686f64 # "verificationMethod"
+            81                                   # array(1)
+               78 40                             # text(64)
+                  6469643a6578616d706c653a313244334b6f6f574d4864727a6377706a6264725a7335474771455241766367715833623564707550745061396f743639796577 # "did:example:12D3KooWMHdrzcwpjbdrZs5GGqERAvcgqX3b5dpuPtPa9ot69yew"
+
+
+
+
+
+

Converting Data between Core Representations

+

Transformation between various core representations SHOULD be performed through parsing and serializing via the Abstract DID Document Data Model (see and Production and Consumptions rules between core representation via the Abstract Data Model). + Given that CBOR is a superset of JSON, the following non-normative advice is given for converting a DID document between CBOR and JSON.

-
-

COSE signatures

+
+

+This section conflicts with other parts of the specification, since +conversion has to be defined not between any two representations directly, +but rather in terms of parsing and serializing via the abstract +DID document data model (see and +). The content of this section can +potentially be adapted and re-used in other sections such as the one +about the CBOR representation (see ). +

+
-

-A DID Document proof may be constructed using CBOR semantic tagging, such as -tag 98 for CBOR Object Signing and Encryption (COSE) [[RFC8152]] -

+
+

CBOR to JSON

+

Most of the types in CBOR have direct analogs in JSON. The following constraints allow for lossless conversion from CBOR to JSON:

+
    +
  • A CBOR integer (major type 0 or 1) becomes a JSON number.
    • +
  • A CBOR array (major type 4) becomes a JSON array.
    • +
  • A CBOR map (major type 5) becomes a JSON object. This is possible directly only if all keys are UTF-8 strings. A converter might also convert other keys into UTF-8 strings (such as by converting integers into strings containing their decimal representation); however, doing so introduces a danger of key collision.
    • +
  • CBOR Boolean False (major type 7, additional information 20) becomes a JSON false.
    • +
  • CBOR Boolean True (major type 7, additional information 21) becomes a JSON true.
    • +
  • CBOR Null (major type 7, additional information 22) becomes a JSON null.
    • +
  • A CBOR floating-point value (major type 7, additional information 25 through 27) becomes a JSON number if it is finite (that is, it can be represented in a JSON number); if the value is non-finite (NaN, or positive or negative Infinity), it is represented by the substitute value.
    • +
  • A CBOR byte string with an encoding hint (major type 6, tag number 21 through 23) is encoded as described and becomes a JSON string.
    • +
+ +

+ When interoperating with a text-based representation such as JSON or JSON-LD it is helpful to utilize additional sematics to aid convertion. CBOR Tags numbers 21 to 23 indicate that a byte string value in DID document represented in CBOR might require a specific encoding to represent properly in JSON. +

- 
-  D8 62                                        # tag(98)
-  67                                           #   text(7)
-     7061796c6f6164                            #     "payload"
-  d8 2a                                        #   tag(42)
-     58 25                                     #     bytes(37)
-        00017112206c8fdc5c3d2302dda95034       #       "\x00\x01q\x12 l\x8f\xdc\\=#\x02\xdd\xa9P4"
-        f9de57a8591918ecb7d7789387c547f7       #       "\xf9\xdeW\xa8Y\x19\x18\xec\xb7\xd7x\x93\x87\xc5G\xf7"
-        a89d05e72f                             #       "\xa8\x9d\x05\xe7/"
-  69                                           #   text(9)
-     70726f746563746564                        #     "protected"
-  a0                                           #   map(0)
-  6a                                           #   text(10)
-     7369676e617475726573                      #     "signatures"
-  81                                           #   array(1)
-     a3                                        #     map(3)
-        69                                     #       text(9)
-           70726f746563746564                  #         "protected"
-        66                                     #       text(6)
-           613130313236                        #         "a10126"
-        69                                     #       text(9)
-           7369676e6174757265                  #         "signature"
-        78 80                                  #       text(128)
-           65326165616664343064363964313964    #         "e2aeafd40d69d19d"
-           66653665353230373763356437666634    #         "fe6e52077c5d7ff4"
-           65343038323832636265666235643036    #         "e408282cbefb5d06"
-           63626634313461663265313964393832    #         "cbf414af2e19d982"
-           61633435616339386238353434633930    #         "ac45ac98b8544c90"
-           38623435303764653165393062373137    #         "8b4507de1e90b717"
-           63336433343831366665393236613262    #         "c3d34816fe926a2b"
-           39386635336166643266613066333061    #         "98f53afd2fa0f30a"
-        6b                                     #       text(11)
-           756e70726f746563746564              #         "unprotected"
-        a1                                     #       map(1)
-           63                                  #         text(3)
-              6b6964                           #           "kid"
-           78 85                               #         text(133)
-              6469643a697069643a313244334b6f6f #           "did:ipid:12D3Koo"
-              574d4864727a6377706a6264725a7335 #           "WMHdrzcwpjbdrZs5"
-              47477145524176636771583362356470 #           "GGqERAvcgqX3b5dp"
-              7550745061396f7436397965773b6970 #           "uPtPa9ot69yew;ip"
-              69643a6b65792d69643d626166797265 #           "id:key-id=bafyre"
-              6963756274783577716f336e6f736334 #           "icubtx5wqo3nosc4"
-              63617a726b6374666877643672657765 #           "cazrkctfhwd6rewe"
-              7a6770776f6534737769726c73346562 #           "zgpwoe4swirls4eb"
-              6468733269                       #           "dhs2i"
-  6b                                           #   text(11)
-     756e70726f746563746564                    #     "unprotected"
-  a0                                           #   tag(0)
-
-
-
+ + +
@@ -5039,7 +4983,7 @@

application/did+cbor

Restrictions on usage:
None
Author(s):
-
Drummond Reed, Manu Sporny, Markus Sabadello, Dave Longley, Christopher Allen, Jonathan Holt
+
Drummond Reed, Manu Sporny, Markus Sabadello, Dave Longley, Christopher Allen
Change controller:
W3C
@@ -5099,7 +5043,7 @@

application/did+dag+cbor

Restrictions on usage:
None
Author(s):
-
Drummond Reed, Manu Sporny, Markus Sabadello, Dave Longley, Christopher Allen, Jonathan Holt
+
Drummond Reed, Manu Sporny, Markus Sabadello, Dave Longley, Christopher Allen
Change controller:
W3C