尝试使用http://www.jsonschemavalidator.net/验证以下架构时，
{
"id": "http://some.site.somewhere/entry-schema#",
"$schema": "http://json-schema.org/draft-04/schema#",
"description": "schema for the FormularSpecification",
"definitions": {
"elementId": {
"id": "http://jsonschema.net/elementId",
"type": "string"
},
"mappingKey": {
"id": "http://jsonschema.net/mappingKey",
"type": "string"
},
"elementType": {
"id": "http://jsonschema.net/elementType",
"type": "string"
},
"length": {
"id": "http://jsonschema.net/length",
"type": "integer"
},
"label": {
"id": "http://jsonschema.net/label",
"type": "string"
},
"content": {
"id": "http://jsonschema.net/content",
"type": "string"
},
"placeholder": {
"id": "http://jsonschema.net/placeholder",
"type": "string"
},
"date": {
"id": "http://jsonschema.net/date",
"type": "string"
},
"option": {
"id": "http://jsonschema.net/option",
"type": "object",
"properties": {
"elementId": { "$ref": "#/definitions/elementId" },
"label": { "$ref": "#/definitions/label" }
},
"required": ["elementId", "label"]
},
"options": {
"id": "http://jsonschema.net/options",
"type": "array",
"items": { "$ref": "#/definitions/option" },
"minItems": 1,
"uniqueItems": true
},
"textfield": {
"id": "http://jsonschema.net/textfield",
"type": "object",
"properties": {
"elementId": { "$ref": "#/definitions/elementId" },
"length": { "$ref": "#/definitions/length" },
"label": { "$ref": "#/definitions/label" },
"placeholder": { "$ref": "#/definitions/placeholder" },
"textfieldType": {
"enum": [ "text", "ext4", "btrfs" ]
}
},
"required": ["elementId", "length", "label", "placeholder", "textfieldType"]
},
"checkbox": {
"id": "http://jsonschema.net/checkbox",
"type": "object",
"properties": {
"label": { "$ref": "#/definitions/label" }
},
"required": ["label"]
},
"radio": {
"id": "http://jsonschema.net/radio",
"type": "object",
"properties": {
"label": { "$ref": "#/definitions/label" },
"options": { "$ref": "#/definitions/options" }
},
"required": ["label", "options"]
},
"dropdown": {
"id": "http://jsonschema.net/dropdown",
"type": "object",
"properties": {
"label": { "$ref": "#/definitions/label" },
"options": { "$ref": "#/definitions/options" }
},
"required": ["label", "options"]
},
"validator": {
"id": "http://jsonschema.net/validator",
"type": "object",
"properties": {
"elementId": { "$ref": "#/definitions/elementId" }
}
},
"validators": {
"id": "http://jsonschema.net/validators",
"type": "array",
"items": { "$ref": "#/definitions/validator" }
},
"interactiveDetails": {
"type": "object",
"oneOf": [
{ "textfield": { "$ref": "#/definitions/textfield" } },
{ "checkbox": { "$ref": "#/definitions/checkbox" } },
{ "radio": { "$ref": "#/definitions/radio" } },
{ "dropdown": { "$ref": "#/definitions/dropdown" } },
{ "date": { "$ref": "#/definitions/date" } }
]
},
"interactive": {
"id": "http://jsonschema.net/interactive",
"type": "object",
"properties": {
"elementId": { "$ref": "#/definitions/elementId" },
"elementType": { "$ref": "#/definitions/elementType" },
"mappingKey": { "$ref": "#/definitions/mappingKey" },
"validators": { "$ref": "#/definitions/validators" },
"interactiveDetails" : { "$ref": "#/definitions/interactiveDetails" }
},
"required": ["elementId", "elementType", "mappingKey", "validators"]
},
"interactives": {
"id": "http://jsonschema.net/interactives",
"type": "array",
"items": { "$ref": "#/definitions/interactive" }
},
"description": {
"id": "http://jsonschema.net/description",
"type": "object",
"properties": {
"elementId": { "$ref": "#/definitions/elementId" },
"elementType": { "$ref": "#/definitions/elementType" },
"content": { "$ref": "#/definitions/content" }
},
"required": ["elementId", "elementType", "content"]
},
"descriptions": {
"items": { "$ref": "#/definitions/description" }
},
"children": {
"items": {
"anyOf": [
{ "$ref": "#/definitions/group" },
{ "$ref": "#/definitions/question" }
]
},
"minItems": 1
},
"question": {
"type": "object",
"properties": {
"elementId": { "$ref": "#/definitions/elementId" },
"descriptions": { "$ref": "#/definitions/descriptions" },
"interactives": { "$ref": "#/definitions/interactives" }
},
"required": ["elementId", "descriptions", "interactives"]
},
"group": {
"type": "object",
"properties": {
"elementId": { "$ref": "#/definitions/elementId" },
"descriptions": { "$ref": "#/definitions/descriptions" },
"children": { "$ref": "#/definitions/children"}
},
"required": ["elementId", "descriptions", "children"]
}
},
"type": "object",
"properties": {
"elementId": { "$ref": "#/definitions/elementId" },
"description": { "$ref": "#/definitions/descriptions" },
"children": { "$ref": "#/definitions/children" }
},
"required": [
"elementId",
"descriptions",
"children"
]
}
我收到以下错误：
Error when resolving schema reference '#/definitions/elementId'. Path 'definitions.description.properties.elementId', line 135, position 30.
我无法弄清问题是什么。我多次扫描文档并查看了教程，但我没有任何线索。
答案 0 :(得分：1)
id关键字的语义有点令人困惑。我不确定自己完全理解它。通常，将id包含在模式的根目录之外的任何地方几乎都不是一个好主意。
“id”关键字（或“id”，简称“）”用于更改分辨率范围。遇到id时，实现必须针对最直接的父作用域解析此id。解析的URI将是此子模式及其所有子项的新解析范围，直到遇到另一个id。
请考虑以下摘自您的架构。由于您包含id关键字，因此您的“elementId”和“label”$ref无法按照您的预期解析文档的根，它们会从最近的父架构{{1}解析}。
id我已经看到，在某些圈子中，人们为每个子模式编写"option": {
"id": "http://jsonschema.net/option",
"type": "object",
"properties": {
"elementId": { "$ref": "#/definitions/elementId" },
"label": { "$ref": "#/definitions/label" }
},
"required": ["elementId", "label"],
"definitions": { ... } <-- your $refs expect values here
}
},
s的模式。我不确定他们认为他们会做出什么好处，但我怀疑他们认为id只是一个标签而不理解它如何改变决议范围。
如果您有充分的理由在任何地方使用id并希望将其保留，您可以在发生冲突时明确引用根id。
id