18.4. General

This page describes the syntax of “meta.json” file which is a part of NextGIS Formbuilder project file (with “.ngfp” extension). The file uses the JSON specification rules and is encoded in UTF-8.

18.5. Syntax

Example of the “meta.json” file:

{
   "fields" : [
      {
         "datatype" : "INTEGER",
         "display_name" : "Amount of objects",
         "keyname" : "amount"
      },
      {
         "datatype" : "REAL",
         "display_name" : "Size of area",
         "keyname" : "area"
      },
      {
         "datatype" : "STRING",
         "display_name" : "Comments",
         "keyname" : "comments"
      }
   ],
   "geometry_type" : "POINT",
   "ngw_connection" : null,
   "srs" : {
      "id" : "4326"
   },
   "version" : "3.0"
}

The root of the file has a json-object type and consists of the following pairs.

<json array fields

The list of the layer fields. Fully corresponds to the NextGIS Web fields description syntax.

<json string geometry_type

Layer’s geometry type. Fully corresponds to the NextGIS Web list of geometry types.

<json jsonobj ngw_connection

Currently is a null value.

<json jsonobj srs

Layer’s Spatial Reference System. Fully corresponds to the NextGIS Web SRS description syntax.

<json string version

Format version of the .ngfp file.