{
  "code": null,
  "collection": "architecture",
  "href": "https://banes-lab.com/ontology#architecture-forward-compatibility",
  "id": "forward-compatibility",
  "kind": "constraint",
  "layer": {
    "href": "https://banes-lab.com/ontology/schema#layer-contracts-core",
    "json": "https://banes-lab.com/json/records/layer/contracts-core",
    "label": "Contracts Core",
    "markdown": "https://banes-lab.com/records/layer/contracts-core.md",
    "ref": "layer:contracts-core"
  },
  "name": "Forward Compatibility",
  "ref": "architecture:forward-compatibility",
  "relations": [
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-extensible-schema",
          "json": "https://banes-lab.com/json/records/lexicon/extensible-schema",
          "label": "Extensible Schema",
          "markdown": "https://banes-lab.com/records/lexicon/extensible-schema.md",
          "ref": "lexicon:extensible-schema"
        }
      ],
      "relation": "requires"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology#architecture-evolutionary-architecture",
          "json": "https://banes-lab.com/json/records/architecture/evolutionary-architecture",
          "label": "Evolutionary Architecture",
          "markdown": "https://banes-lab.com/records/architecture/evolutionary-architecture.md",
          "ref": "architecture:evolutionary-architecture"
        }
      ],
      "relation": "reinforces"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-rolling-upgrades",
          "json": "https://banes-lab.com/json/records/lexicon/rolling-upgrades",
          "label": "Rolling Upgrades",
          "markdown": "https://banes-lab.com/records/lexicon/rolling-upgrades.md",
          "ref": "lexicon:rolling-upgrades"
        }
      ],
      "relation": "enables"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-strict-fragile-parsers",
          "json": "https://banes-lab.com/json/records/lexicon/strict-fragile-parsers",
          "label": "Strict Fragile Parsers",
          "markdown": "https://banes-lab.com/records/lexicon/strict-fragile-parsers.md",
          "ref": "lexicon:strict-fragile-parsers"
        }
      ],
      "relation": "conflicts-with"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-strong-validation",
          "json": "https://banes-lab.com/json/records/lexicon/strong-validation",
          "label": "Strong Validation",
          "markdown": "https://banes-lab.com/records/lexicon/strong-validation.md",
          "ref": "lexicon:strong-validation"
        }
      ],
      "relation": "tensions-with"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology/schema#tension-forward-compatibility-strong-validation",
          "json": "https://banes-lab.com/json/records/tension/forward-compatibility-strong-validation",
          "label": "Forward Compatibility / Strong Validation",
          "markdown": "https://banes-lab.com/records/tension/forward-compatibility-strong-validation.md",
          "ref": "tension:forward-compatibility-strong-validation"
        }
      ],
      "relation": "tensions"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-strict-fragile-parsers",
          "json": "https://banes-lab.com/json/records/lexicon/strict-fragile-parsers",
          "label": "Strict Fragile Parsers",
          "markdown": "https://banes-lab.com/records/lexicon/strict-fragile-parsers.md",
          "ref": "lexicon:strict-fragile-parsers"
        }
      ],
      "relation": "violated-by"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology#architecture-extension-points",
          "json": "https://banes-lab.com/json/records/architecture/extension-points",
          "label": "Extension Points",
          "markdown": "https://banes-lab.com/records/architecture/extension-points.md",
          "ref": "architecture:extension-points"
        },
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-tolerant-reader",
          "json": "https://banes-lab.com/json/records/lexicon/tolerant-reader",
          "label": "Tolerant Reader",
          "markdown": "https://banes-lab.com/records/lexicon/tolerant-reader.md",
          "ref": "lexicon:tolerant-reader"
        }
      ],
      "relation": "refactored-by"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology/schema#vocabulary-severity-recommended",
          "json": "https://banes-lab.com/json/records/vocabulary/severity-recommended",
          "label": "recommended",
          "markdown": "https://banes-lab.com/records/vocabulary/severity-recommended.md",
          "ref": "vocabulary:severity-recommended"
        }
      ],
      "relation": "severity"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology#architecture-category-contracts-interfaces-compatibility",
          "json": "https://banes-lab.com/json/records/architecture-category/contracts-interfaces-compatibility",
          "label": "Contracts / Interfaces / Compatibility",
          "markdown": "https://banes-lab.com/records/architecture-category/contracts-interfaces-compatibility.md",
          "ref": "architecture-category:contracts-interfaces-compatibility"
        }
      ],
      "relation": "category"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology#architecture-category-architecture-review-evolution-governance-artifacts",
          "json": "https://banes-lab.com/json/ontology/principles/architecture-category-architecture-review-evolution-governance-artifacts",
          "label": "Architecture Review / Evolution / Governance Artifacts",
          "markdown": "https://banes-lab.com/ontology/principles/architecture-category-architecture-review-evolution-governance-artifacts.md",
          "ref": "chapter:/ontology#architecture-category-architecture-review-evolution-governance-artifacts"
        },
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-category-contracts-interfaces-compatibility",
          "json": "https://banes-lab.com/json/ontology/lexicon/lexicon-category-contracts-interfaces-compatibility",
          "label": "Contracts / Interfaces / Compatibility",
          "markdown": "https://banes-lab.com/ontology/lexicon/lexicon-category-contracts-interfaces-compatibility.md",
          "ref": "chapter:/ontology/lexicon#lexicon-category-contracts-interfaces-compatibility"
        },
        {
          "href": "https://banes-lab.com/ontology/schema#the-vocabulary-severity",
          "json": "https://banes-lab.com/json/ontology/schema/the-vocabulary-severity",
          "label": "Severity levels",
          "markdown": "https://banes-lab.com/ontology/schema/the-vocabulary-severity.md",
          "ref": "chapter:/ontology/schema#the-vocabulary-severity"
        },
        {
          "href": "https://banes-lab.com/ontology/schema#the-resolutions",
          "json": "https://banes-lab.com/json/ontology/schema/the-resolutions",
          "label": "The resolutions",
          "markdown": "https://banes-lab.com/ontology/schema/the-resolutions.md",
          "ref": "chapter:/ontology/schema#the-resolutions"
        }
      ],
      "relation": "linked-from"
    }
  ],
  "summary": "A rule or precondition that an older reader accepts data from a newer writer by ignoring the fields it does not know rather than failing on them.",
  "siblings": {
    "next": {
      "href": "https://banes-lab.com/ontology#architecture-versioning",
      "json": "https://banes-lab.com/json/records/architecture/versioning",
      "label": "Versioning",
      "markdown": "https://banes-lab.com/records/architecture/versioning.md",
      "ref": "architecture:versioning"
    },
    "previous": {
      "href": "https://banes-lab.com/ontology#architecture-backward-compatibility",
      "json": "https://banes-lab.com/json/records/architecture/backward-compatibility",
      "label": "Backward Compatibility",
      "markdown": "https://banes-lab.com/records/architecture/backward-compatibility.md",
      "ref": "architecture:backward-compatibility"
    }
  },
  "up": {
    "href": null,
    "json": "https://banes-lab.com/json/api/records/architecture",
    "label": "Architecture principles",
    "markdown": "https://banes-lab.com/api/records/architecture.md",
    "ref": "api:records/architecture"
  },
  "aliases": [
    "Unknown Field Handling"
  ],
  "exemplar": {
    "after": "type FooEnvelope = { name: string; extensions?: Record<string, unknown> };\nfunction readFoo(input: FooEnvelope) {\n  return { name: input.name, extensions: input.extensions ?? {} };\n}",
    "before": "function readFoo(input: { name: string }) {\n  if (Object.keys(input).length !== 1) throw new Error(\"unknown field\");\n  return input.name;\n}",
    "lang": "ts",
    "medium": "code"
  },
  "formedBy": null,
  "scope": [
    "API",
    "schema",
    "protocol"
  ],
  "severity": "recommended"
}