// SPDX-FileCopyrightText: Copyright 2015-2025 go-swagger maintainers
// SPDX-License-Identifier: Apache-2.0

// Package validate provides methods to validate a swagger specification,
// as well as tools to validate data against their schema.
//
// This package follows Swagger 2.0. specification (aka OpenAPI 2.0). Reference.
// can be found here: https://github.com/OAI/OpenAPI-Specification/blob/master/versions/2.0.md.
//
// # Validating a specification
//
// Validates a spec document (from JSON or YAML) against the JSON schema for swagger,
// then checks a number of extra rules that can't be expressed in JSON schema.
//
// Entry points:
//
//   - Spec()
//   - [NewSpecValidator]()
//   - [SpecValidator].Validate()
//
// Reported as errors:
//
//	[x] definition can't declare a property that's already defined by one of its ancestors
//	[x] definition's ancestor can't be a descendant of the same model
//	[x] path uniqueness: each api path should be non-verbatim (account for path param names) unique per method. Validation can be laxed by disabling StrictPathParamUniqueness.
//	[x] each security reference should contain only unique scopes
//	[x] each security scope in a security definition should be unique
//	[x] parameters in path must be unique
//	[x] each path parameter must correspond to a parameter placeholder and vice versa
//	[x] each referenceable definition must have references
//	[x] each definition property listed in the required array must be defined in the properties of the model
//	[x] each parameter should have a unique `name` and `type` combination
//	[x] each operation should have only 1 parameter of type body
//	[x] each reference must point to a valid object
//	[x] every default value that is specified must validate against the schema for that property
//	[x] items property is required for all schemas/definitions of type `array`
//	[x] path parameters must be declared a required
//	[x] headers must not contain $ref
//	[x] schema and property examples provided must validate against their respective object's schema
//	[x] examples provided must validate their schema
//
// Reported as warnings:
//
//	[x] path parameters should not contain any of [{,},\w]
//	[x] empty path
//	[x] unused definitions
//	[x] unsupported validation of examples on non-JSON media types
//	[x] examples in response without schema
//	[x] readOnly properties should not be required
//
// # Validating a schema
//
// The schema validation toolkit validates data against JSON-schema-draft 04 schema.
//
// It is tested against the full json-schema-testing-suite (https://github.com/json-schema-org/JSON-Schema-Test-Suite),
// except for the optional part (bignum, ECMA regexp, ...).
//
// It supports the complete JSON-schema vocabulary, including keywords not supported by Swagger (e.g. additionalItems, ...)
//
// Entry points:
//
//   - [AgainstSchema]()
//   - ...
//
// # Known limitations
//
// With the current version of this package, the following aspects of swagger are not yet supported:
//
//	[ ] errors and warnings are not reported with key/line number in spec
//	[ ] default values and examples on responses only support application/json producer type
//	[ ] invalid numeric constraints (such as Minimum, etc..) are not checked except for default and example values
//	[ ] rules for collectionFormat are not implemented
//	[ ] no validation rule for polymorphism support (discriminator) [not done here]
//	[ ] valid js ECMA regexp not supported by Go regexp engine are considered invalid
//	[ ] arbitrary large numbers are not supported: max is math.MaxFloat64
package validate