feat(ro-crate): add example for inclusion of odrl

An odrl policy is included in the metadata using a yet unused property
of the type [Dataset](https://schema.org/Dataset). The whole thing
probably is terribly wrong, as i do not have deeper knowledge of
schema.org/bioschemas/agrischemas. Yet i wanted to provide an example
for discussion.

The ODRL was provided by @StephanLesch and goes a bit beyond what
CC-BY-NC includes by limiting the access to either by request or only
for registered users.

Alternatives:
- Using [additionalProperty](https://schema.org/additionalProperty)
- Using the license type and include the odrl policy there. But that
  would probably break existing implementations. Same for
  CopyrightNotice
- Separate file instead of being included in the "general" metadata

Open problems:
- How do license and odrlPolicy relate to each other? If for example the
  license property has CC-BY, but the ODRL restricts the use to small
  and medium enterprises or research institutions?
- Similiar: What do with the (at least for Bioschemas) mandatory license
  property if there is an odrlPolicy? Use a value like "odrl" to
  indicate that?

Related:
- nfdi4plants/arc-ro-crate-profile#19
- nfdi4plants/ARC-specification#133
- https://github.com/IPK-BIT/odrl-builder

Author: Constantin Breß

ro-crates/examples/10.4228-ZALF.1992.271-ODRL/ro-create-metadata.json

@@ -0,0 +1,210 @@
+{
+	"@context": [
+		"https://w3id.org/ro/crate/1.1/context",
+		{
+			"odrl": "http://www.w3.org/ns/odrl.jsonld",
+			"cc": "http://creativecommons.org/ns",
+			"rdfs": "http://www.w3.org/2000/01/rdf-schema#",
+			"dct": "http://purl.org/dc/terms/",
+			"foaf": "http://xmlns.com/foaf/0.1/",
+			"ldr": "http://purl.org/NET/ldr/ns#"
+		}
+	],
+	"@graph": [
+		{
+			"@id": "ro-crate-metadata.json",
+			"@type": "CreativeWork",
+			"conformsTo": {
+				"@id": "https://w3id.org/ro/crate/1.1"
+			},
+			"about": {
+				"@id": "./"
+			}
+		},
+		{
+			"@id": "./",
+			"@type": "Dataset",
+			"hasPart": [
+				{
+					"@id": "files/v004_crop_carbon_nitrogen.csv"
+				},
+				{
+					"@id": "files/v004_crop_ontogenesis_biomass.csv"
+				}
+			],
+			"dct:conformsTo": {
+				"@id": "https://bioschemas.org/profiles/Dataset/1.0-RELEASE"
+			},
+			"creator": {
+				"@id": "https://orcid.org/0000-0002-3620-3171"
+			},
+			"schema:creditText": "Mirschel, Wilfried; Schindler, Uwe; Hufnagel, Johannes; Barkusky, Dietmar; Dittmar, Sigrid; Voigt, Carola; Laacke, Liane (2014): Coherent multivariable 6-year field trial data set for agro-ecosystem model verification and validation from Müncheberg experimental station, Leibniz-Zentrum für Agrarlandschaftsforschung (ZALF) e.V.[doi: 10.4228/ZALF.1992.271]",
+			"description": "For the intensive agro-management level a 6-year (1993-1998) multivariable data set for a 4-field crop rotation located at the Müncheberg Experimental Station with sandy soils (Eutric Cambisol) is documented in detail. Here rainfed and irrigated conditions are taken into account. The soil, weather and crop processes have been intensively monitored. The data set contains coherent soil (water, mineral nitrogen), crop (ontogenesis, biomass, yield, carbon and nitrogen content), weather (meteorological standard parameter) and management (soil tillage, sowing, fertilization, irrigation, harvest) data with different time resolutions. The data set was used for model intercomparison within the crop modelling (CropM) part of the international FACCE MACSUR project.",
+			"editor": {
+				"@id": "https://ror.org/01ygyzs83"
+			},
+			"identifier": "http://doi.org/10.4228/ZALF.1992.271",
+			"about": {
+				"@id": "_:nc238f7608de8496dadf3f24d3b199823b5"
+			},
+			"schema:keyword": [
+				{
+					"@id": "http://aims.fao.org/aos/agrovoc/c_29103"
+				},
+				{
+					"@id": "http://www.eionet.europa.eu/gemet/concept/232"
+				}
+			],
+			"license": {
+				"@id": "https://creativecommons.org/licenses/by-nc/4.0/legalcode"
+			},
+			"odrlPolicy": [
+				{
+					"_comment": "licence = cc-by nc. Quelle: https://raw.githubusercontent.com/w3c/odrl/master/bp/license/rdflicense/cc-by-nc4.0.ttl",
+					"@type": "odrl:policy",
+					"@id": "http://creativecommons.org/licenses/by-nc/4.0/",
+					"rdfs:label": "Creative Commons CC-BY-NC",
+					"rdfs:seeAlso": "http://creativecommons.org/licenses/by-nc/4.0/legalcode",
+					"cc:legalcode": "\r\nCreative Commons Attribution-NonCommercial 4.0 International Public License\r\n\r\nBy exercising the Licensed Rights (defined below), You accept and agree to be bound by the terms and conditions of this Creative Commons Attribution-NonCommercial 4.0 International Public License (\"Public License\"). [...]",
+					"dct:alternative": "CC BY-NC",
+					"dct:hasVersion": "4.0",
+					"dct:language": "http://www.lexvo.org/page/iso639-3/eng",
+					"dct:publisher": "Creative Commons",
+					"dct:source": "http://creativecommons.org/licenses/by-nc/4.0/",
+					"dct:title": "Creative Commons - Attribution-NonCommercial 4.0 International - CC BY-NC 4.0\"@en",
+					"odrl:permission": {
+						"odrl:action": [
+							"cc:Distribution",
+							"ldr:extraction",
+							"cc:Reproduction",
+							"cc:DerivativeWorks",
+							"ldr:reutilization"
+						],
+						"odrl:duty": {
+							"odrl:action": [
+								"cc:Notice",
+								"cc:Attribution"
+							]
+						}
+					},
+					"odrl:prohibition": {
+						"odrl:action": "cc:CommercialUse"
+					},
+					"foaf:logo": "http://i.creativecommons.org/l/by-nc/2.0/88x31.png"
+				},
+				{
+					"_comment": "Allgemeine Einschränkung der RDI, dass nur angemeldete User die Daten bekommen",
+					"@type": "odrl:Rule",
+					"@id": "http://edaphobase.org/RegisterRequired",
+					"odrl:assignee": {
+						"@type": "foaf:OnlineAccount"
+					}
+				},
+				{
+					"comment": "Einschränkung dieses Datensatzes, dass Daten nur auf Anfrage erreichbar sind",
+					"@type": "odrl:Rule",
+					"@id": "http://edaphobase.org/DataOnRequest",
+					"odrl:prohibition": {
+						"odrl:action": "odrl:read"
+					}
+				}
+			],
+			"name": "Coherent multivariable 6-year field trial data set for agro-ecosystem model verification and validation from Müncheberg experimental station",
+			"publisher": {
+				"@id": "https://ror.org/01ygyzs83"
+			},
+			"spatialCoverage": {
+				"@id": "_:nc238f7608de8496dadf3f24d3b199823b1"
+			},
+			"temporalCoverage": "1993/1998",
+			"url": "https://open-research-data.zalf.de/SitePages/DatasetInformation.aspx?ord=1992_271",
+			"variableMeasured": [
+				{
+					"@id": "_:nc238f7608de8496dadf3f24d3b199823b3"
+				},
+				{
+					"@id": "_:nc238f7608de8496dadf3f24d3b199823b4"
+				}
+			]
+		},
+		{
+			"@id": "files/v004_crop_carbon_nitrogen.csv",
+			"@type": "File",
+			"contentSize": "23089",
+			"description": "Table containing crop_carbon_nitrogen measurements",
+			"encodingFormat": "text/csv",
+			"name": "v004_crop_carbon_nitrogen"
+		},
+		{
+			"@id": "files/v004_crop_ontogenesis_biomass.csv",
+			"@type": "File",
+			"contentSize": "23723",
+			"description": "Table containing v004_crop_ontogenesis_biomass measurments",
+			"encodingFormat": "text/csv",
+			"name": "v004_crop_ontogenesis_biomass"
+		},
+		{
+			"@id": "https://ror.org/01ygyzs83",
+			"@type": "Organization",
+			"name": "Leibniz-Zentrum für Agrarlandschaftsforschung (ZALF) e.V."
+		},
+		{
+			"@id": "http://aims.fao.org/aos/agrovoc/c_29103",
+			"@type": "DefinedTerm"
+		},
+		{
+			"@id": "http://www.eionet.europa.eu/gemet/concept/232",
+			"@type": "DefinedTerm"
+		},
+		{
+			"@id": "_:nc238f7608de8496dadf3f24d3b199823b1",
+			"@type": "Place",
+			"geo": {
+				"@id": "_:nc238f7608de8496dadf3f24d3b199823b2"
+			}
+		},
+		{
+			"@id": "_:nc238f7608de8496dadf3f24d3b199823b2",
+			"@type": "GeoShape",
+			"box": "14.12174911, 52.51578495, 14.12385331, 52.51706814"
+		},
+		{
+			"@id": "_:nc238f7608de8496dadf3f24d3b199823b3",
+			"@type": "PropertyValue",
+			"name": "PRECIPITATION_MM",
+			"propertyID": {
+				"@id": "https://agrovoc.fao.org/browse/agrovoc/en/page/c_6161"
+			}
+		},
+		{
+			"@id": "_:nc238f7608de8496dadf3f24d3b199823b4",
+			"@type": "PropertyValue",
+			"name": "TOTAL_NITROGEN_PROZ",
+			"propertyID": {
+				"@id": "https://agrovoc.fao.org/browse/agrovoc/en/page/c_5193"
+			}
+		},
+		{
+			"@id": "_:nc238f7608de8496dadf3f24d3b199823b5",
+			"@type": "https://bioschemas.org/BioChemEntity",
+			"dct:conformsTo": {
+				"@id": "https://bioschemas.org/profiles/Crop/0.1-TO-BE-CREATED"
+			},
+			"https://bioschemas.org/taxonomicRange": {
+				"@id": "http://aims.fao.org/aos/agrovoc/c_7499"
+			}
+		},
+		{
+			"@id": "https://orcid.org/0000-0002-3620-3171",
+			"@type": "Person",
+			"name": "Wilfried Mirschel"
+		},
+		{
+			"@id": "http://aims.fao.org/aos/agrovoc/c_7499",
+			"@type": "DefinedTerm",
+			"inDefinedTermSet": {
+				"@id": "http://aims.fao.org/aos/agrovoc"
+			}
+		}
+	]
+}