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GeoJSON                                                       S. Gillies
Internet-Draft                                                    Mapbox
Intended status: Standards Track                       February 17, 2017
Expires: August 21, 2017


                         GeoJSON Text Sequences
                  draft-ietf-geojson-text-sequence-05

Abstract

   This document describes the GeoJSON text sequence format and
   "application/geo+json-seq" media type.  This format is based on
   JavaScript Object Notation (JSON) Text Sequences and GeoJSON, and
   makes arbitrarily large geographic datasets incrementally parseable
   without restricting the form of GeoJSON texts within a sequence.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on August 21, 2017.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   described in the Simplified BSD License.



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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   2
   2.  GeoJSON Text Sequence Format  . . . . . . . . . . . . . . . .   2
   3.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   4.  Interoperability Considerations . . . . . . . . . . . . . . .   3
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   Arbitrarily large sequences of values pose a problem for JavaScript
   Object Notation (JSON) [RFC7159] that is well explained in the
   motivation for JSON Text Sequences [RFC7464].  The GeoJSON format
   [RFC7946] faces the same kind of problem.  Geographic datasets often
   run to the tens of thousands or millions of features.  The problem is
   often amplified by the presence of large arrays of coordinates for
   each of the features.

   This document describes a specialization of JSON Text Sequences.  A
   GeoJSON Text Sequence is a document of arbitrarily large size
   containing one or more GeoJSON objects, e.g., multiple GeoJSON texts
   that can be produced and parsed incrementally, and not only a single
   GeoJSON FeatureCollection, Feature, or Geometry.

1.1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in
   [RFC2119].

2.  GeoJSON Text Sequence Format

   Defined in prose, following [RFC7464]: a GeoJSON text sequence is any
   number of GeoJSON [RFC7946] texts, each encoded in UTF-8 [RFC3629],
   each preceded by one ASCII [RFC20] RS character, and each followed by
   a line feed (LF).

   The GeoJSON Text Sequence Format conforms to all the rules of
   [RFC7464] and adds the following constraint: each JSON text MUST
   contain a single GeoJSON object as defined in [RFC7946].





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   Heterogeneous sequences containing a mix of GeoJSON Geometry,
   Feature, and FeatureCollection objects are permitted.  How producers
   and parsers of GeoJSON text sequences communicate rules for allowed
   GeoJSON types in exchanged sequences is not specified in this
   document.

3.  Security Considerations

   GeoJSON text sequences have no security considerations beyond those
   of JSON text sequences and the GeoJSON format.

4.  Interoperability Considerations

   The advantage of using ASCII character RS "0x1e" to denote a text is
   that sequence producers and parsers need not enforce a canonical form
   of GeoJSON.  Any valid GeoJSON, pretty-printed or compact, can be
   used in a GeoJSON text sequence.

   A variety of parsers designed for newline-delimited sequences of
   compact JSON text are deployed on the internet today.  While there is
   no canonical form for JSON texts, and pretty-printed and compact
   forms are equally valid, GeoJSON text sequences containing compact
   GeoJSON texts with no internal newlines are more interoperable with
   existing non-standardized parsers.

   In a distributed system where order and exactly-once delivery of
   messages are difficult to achieve, GeoJSON text sequences that do not
   rely on order of texts for extra semantics are more interoperable
   than those that do.

5.  IANA Considerations

   The MIME media type for GeoJSON feature sequences is "application/
   geo+json-seq".  This uses the suffix established in
   [I-D.wilde-json-seq-suffix].

   Type name:  application

   Subtype name:  geo+json-seq

   Required parameters:  n/a

   Optional parameters:  n/a

   Encoding considerations:  binary

   Security considerations:  See [[This document]] Section 3




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   Interoperability considerations:  See [[This document]] Section 4

   Published specification:  [[This document]]

   Applications that use this media type:  No known applications
      currently use this media type.  This media type is intended for
      GeoJSON applications currently using colloquial line-delimited
      variants of GeoJSON.

   Additional information:

      Magic number(s):  n/a

      File extension(s):  n/a

      Macintosh file type code:  n/a

      Object Identifiers:  n/a

   Person to contact for further information:  Sean Gillies
      (sean.gillies@gmail.com)

   Intended usage:  COMMON

   Restrictions on usage:  none

6.  References

6.1.  Normative References

   [RFC0020]  Cerf, V., "ASCII format for network interchange", STD 80,
              RFC 20, DOI 10.17487/RFC0020, October 1969,
              <http://www.rfc-editor.org/info/rfc20>.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC3629]  Yergeau, F., "UTF-8, a transformation format of ISO
              10646", STD 63, RFC 3629, DOI 10.17487/RFC3629, November
              2003, <http://www.rfc-editor.org/info/rfc3629>.

   [RFC7159]  Bray, T., Ed., "The JavaScript Object Notation (JSON) Data
              Interchange Format", RFC 7159, DOI 10.17487/RFC7159, March
              2014, <http://www.rfc-editor.org/info/rfc7159>.

   [RFC7464]  Williams, N., "JavaScript Object Notation (JSON) Text
              Sequences", RFC 7464, DOI 10.17487/RFC7464, February 2015,
              <http://www.rfc-editor.org/info/rfc7464>.



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   [RFC7946]  Butler, H., Daly, M., Doyle, A., Gillies, S., Hagen, S.,
              and T. Schaub, "The GeoJSON Format", RFC 7946,
              DOI 10.17487/RFC7946, August 2016,
              <http://www.rfc-editor.org/info/rfc7946>.

6.2.  Informative References

   [I-D.wilde-json-seq-suffix]
              Wilde, E., "A Media Type Structured Syntax Suffix for JSON
              Text Sequences", December 2016.

Author's Address

   S. Gillies
   Mapbox

   Email: sean.gillies@gmail.com
   URI:   http://sgillies.net

































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