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update schemata, remove extension language
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‎catalog-spec/json-schema/catalog-core.json‎

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{
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"$schema": "http://json-schema.org/draft-07/schema#",
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"$id": "https://schemas.stacspec.org/v1.0.0-beta.2/catalog-spec/json-schema/catalog.json#",
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"title": "Core STAC Catalog Fields Specification",
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"description": "This object represents the fields shared by Catalogs and Collections",
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"allOf": [
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{
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"$ref": "#/definitions/catalogCore"
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}
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],
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"definitions": {
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"catalogCore": {
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"title": "Catalog Core Fields",
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"type": "object",
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"required": [
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"stac_version",
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"id",
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"description",
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"links",
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],
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"properties": {
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"stac_version": {
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"title": "STAC version",
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"type": "string",
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"const": "1.0.0-beta.2"
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},
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"stac_extensions": {
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"title": "STAC extensions",
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"type": "array",
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"uniqueItems": true,
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"items": {
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"anyOf": [
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{
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"title": "Reference to a JSON Schema",
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"type": "string",
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"format": "iri"
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},
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{
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"title": "Reference to a core extension",
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"type": "string"
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}
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]
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}
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},
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"id": {
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"title": "Identifier",
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"type": "string"
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},
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"title": {
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"title": "Title",
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"type": "string"
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},
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"description": {
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"title": "Description",
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"type": "string"
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},
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"links": {
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"title": "Links",
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"type": "array",
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"items": {
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"$ref": "#/definitions/link"
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}
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},
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"summaries": {
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"$ref": "#/definitions/summaries"
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}
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}
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},
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"link": {
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"type": "object",
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"required": [
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"rel",
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"href"
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],
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"properties": {
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"href": {
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"title": "Link reference",
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"type": "string",
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"format": "iri-reference"
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},
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"rel": {
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"title": "Link relation type",
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"type": "string"
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},
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"type": {
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"title": "Link type",
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"type": "string"
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},
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"title": {
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"title": "Link title",
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"type": "string"
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}
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}
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},
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"summaries": {
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"type": "object",
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"additionalProperties": {
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"oneOf": [
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{
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"title": "Stats",
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"type": "object",
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"required": [
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"minimum",
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"maximum"
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],
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"properties": {
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"minimum": {
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"title": "Minimum value",
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"type": ["number", "string"]
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},
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"maximum": {
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"title": "Maximum value",
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"type": ["number", "string"]
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}
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}
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},
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{
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"title": "Set of values",
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"type": "array",
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"minItems": 1,
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"items": {
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"description": "Any data type could occur."
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}
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}
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]
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}
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}
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}
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}
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‎catalog-spec/json-schema/catalog.json‎

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"title": "STAC Catalog Specification",
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"description": "This object represents Catalogs in a SpatioTemporal Asset Catalog.",
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"allOf": [
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{
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"$ref": "./catalog-core.json"
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},
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{
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"$ref": "#/definitions/catalog"
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}
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"title": "Catalog",
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"type": "object",
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"required": [
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"stac_version",
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"id",
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"description",
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"links"
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],
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"properties": {
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"stac_version": {
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"title": "STAC version",
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"type": "string",
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"const": "1.0.0-beta.2"
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},
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"stac_extensions": {
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"title": "STAC extensions",
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"type": "array",
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"uniqueItems": true,
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"items": {
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"anyOf": [
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{
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"title": "Reference to a JSON Schema",
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"type": "string",
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"format": "iri"
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},
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{
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"title": "Reference to a core extension",
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"type": "string"
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}
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]
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}
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},
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"id": {
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"title": "Identifier",
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"type": "string"
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},
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"title": {
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"title": "Title",
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"type": "string"
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},
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"description": {
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"title": "Description",
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"type": "string"
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},
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"links": {
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"title": "Links",
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"type": "array",
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"items": {
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"$ref": "#/definitions/link"
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}
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},
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"summaries": {
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"$ref": "#/definitions/summaries"
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}
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}
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},
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"link": {
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"type": "object",
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"required": [
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"rel",
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"href"
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"type"
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],
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"properties": {
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"href": {
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"title": "Link reference",
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"type": "string",
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"format": "iri-reference"
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},
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"rel": {
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"title": "Link relation type",
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"type": "string"
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},
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"type": {
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"title": "Link type",
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"type": "string"
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},
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"title": {
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"title": "Link title",
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"type": "string"
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"title": "Type of STAC entityt",
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"const": "Catalog"
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}
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}
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},
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"summaries": {
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"type": "object",
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"additionalProperties": {
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"oneOf": [
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{
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"title": "Stats",
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"type": "object",
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"required": [
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"minimum",
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"maximum"
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],
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"properties": {
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"minimum": {
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"title": "Minimum value",
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"type": ["number", "string"]
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},
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"maximum": {
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"title": "Maximum value",
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"type": ["number", "string"]
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}
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}
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},
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{
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"title": "Set of values",
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"type": "array",
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"minItems": 1,
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"items": {
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"description": "Any data type could occur."
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}
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}
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]
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}
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}
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}
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}

‎collection-spec/collection-spec.md‎

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# STAC Collection Specification
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The STAC Collection Specification defines a set of common fields to describe a group of Items that share properties and metadata. The
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Collection Specification extends the STAC [Catalog Specification](../catalog-spec/catalog-spec.md) with additional fields to
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describe the whole dataset and the included set of Items. It shares the same fields and therefore every Collection is also a valid Catalog. Collections can have both parent Catalogs and Collections and child Items, Catalogs and Collections.
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Collection Specification shares some fields with the STAC [Catalog Specification](../catalog-spec/catalog-spec.md) with additional fields to
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describe the whole dataset and the included set of Items. Collections can have both parent Catalogs and Collections and child Items, Catalogs and Collections.
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A STAC Collection is represented in JSON format. Any JSON object that contains all the required fields is a valid STAC Collection and also a valid STAC Catalog.
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STAC Collections are compatible with the [Collection](http://docs.opengeospatial.org/is/17-069r3/17-069r3.html#example_4) JSON
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specified in [*OGC API - Features*](https://ogcapi.ogc.org/features/), but it is extended with additional fields.
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specified in [*OGC API - Features*](https://ogcapi.ogc.org/features/), but they are extended with additional fields.
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* [Examples](../examples/):
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* Sentinel 2: A basic standalone example of a [Collection](../examples/collection-only/collection.json) without Items.
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* Simple Example: A [Collection](../examples/collection.json) that links to 3 example Items.
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* Extension Collection: An additional [Collection](../examples/extensions-Collection/Collection.json), which is used to highlight
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* Extension Collection: An additional [Collection](../examples/extensions-collection/collection.json), which is used to highlight
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various [extension](../extensions) functionality, but serves as another example.
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* [JSON Schema](json-schema/Collection.json)
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* [JSON Schema](json-schema/collection.json)
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## Collection fields
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‎collection-spec/json-schema/collection.json‎

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"description": "This object represents Collections in a SpatioTemporal Asset Catalog.",
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"allOf": [
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{
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"$ref": "../../catalog-spec/json-schema/catalog.json"
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"$ref": "../../catalog-spec/json-schema/catalog-core.json"
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},
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{
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"$ref": "#/definitions/collection"
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"description": "These are the fields specific to a STAC Collection. All other fields are inherited from STAC Catalog.",
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"type": "object",
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"required": [
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"type",
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"license",
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"extent"
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],
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"properties": {
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"type": {
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"title": "Type of STAC entity",
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"const": "Collection"
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},
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"stac_extensions": {
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"title": "STAC extensions",
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"type": "array",

‎examples/collection-only/collection.json‎

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{
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"type": "Collection",
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"stac_version": "1.0.0-beta.2",
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"stac_extensions": [],
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"id": "sentinel-2",

‎examples/collection.json‎

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{
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"id": "simple-collection",
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"type": "Collection",
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"stac_version": "1.0.0-beta.2",
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"description": "A simple collection demonstrating core catalog fields with links to a couple of items",
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"title": "Simple Example Collection",

‎examples/extensions-collection/collection.json‎

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{
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"id": "extensions-collection",
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"type": "Collection",
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"stac_version": "1.0.0-beta.2",
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"description": "A heterogenous collection containing deeper examples of various extensions",
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"links": [

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