{
  "@context": {
    "@vocab": "https://schema.org/",
    "fhfa": "https://www.fhfa.gov/ns/",
    "hpi": "https://www.fhfa.gov/data/hpi#",
    "nmdb": "https://www.fhfa.gov/data/nmdb#",
    "pudb": "https://www.fhfa.gov/data/pudb#",
    "uad": "https://www.fhfa.gov/data/uad#",

    "GovernmentOrganization": "GovernmentOrganization",
    "DataCatalog": "DataCatalog",
    "Dataset": "Dataset",
    "DataDownload": "DataDownload",
    "NewsArticle": "NewsArticle",

    "name": "name",
    "description": "description",
    "url": "url",
    "sameAs": "sameAs",
    "identifier": "identifier",
    "datePublished": "datePublished",
    "dateModified": "dateModified",
    "license": "license",
    "creator": "creator",
    "publisher": "publisher",
    "keywords": "keywords",
    "encodingFormat": "encodingFormat",
    "contentUrl": "contentUrl",
    "variableMeasured": "variableMeasured",
    "spatialCoverage": "spatialCoverage",
    "temporalCoverage": "temporalCoverage",
    "measurementTechnique": "measurementTechnique",

    "hpiType": {
      "@id": "hpi:hpiType",
      "@type": "xsd:string"
    },
    "hpiFlavor": {
      "@id": "hpi:hpiFlavor",
      "@type": "xsd:string"
    },
    "frequency": {
      "@id": "hpi:frequency",
      "@type": "xsd:string"
    },
    "level": {
      "@id": "hpi:level",
      "@type": "xsd:string"
    },
    "placeName": {
      "@id": "hpi:placeName",
      "@type": "xsd:string"
    },
    "placeId": {
      "@id": "hpi:placeId",
      "@type": "xsd:string"
    },
    "yr": {
      "@id": "hpi:yr",
      "@type": "xsd:integer"
    },
    "period": {
      "@id": "hpi:period",
      "@type": "xsd:integer"
    },
    "indexNsa": {
      "@id": "hpi:indexNsa",
      "@type": "xsd:decimal"
    },
    "indexSa": {
      "@id": "hpi:indexSa",
      "@type": "xsd:decimal"
    },
    "rstderr": {
      "@id": "hpi:rstderr",
      "@type": "xsd:decimal"
    },
    "conformingLoanLimit": {
      "@id": "fhfa:conformingLoanLimit",
      "@type": "xsd:integer"
    },
    "highCostAreaLimit": {
      "@id": "fhfa:highCostAreaLimit",
      "@type": "xsd:integer"
    },
    "countyFips": {
      "@id": "fhfa:countyFips",
      "@type": "xsd:string"
    },
    "gseType": {
      "@id": "fhfa:gseType",
      "@type": "xsd:string"
    },
    "appraisalValue": {
      "@id": "uad:appraisalValue",
      "@type": "xsd:decimal"
    },
    "loanToValue": {
      "@id": "nmdb:loanToValue",
      "@type": "xsd:decimal"
    },
    "mortgageType": {
      "@id": "nmdb:mortgageType",
      "@type": "xsd:string"
    },
    "xsd": "http://www.w3.org/2001/XMLSchema#"
  },
  "@graph": [
    {
      "@type": "GovernmentOrganization",
      "@id": "https://www.fhfa.gov",
      "name": "Federal Housing Finance Agency (FHFA)",
      "description": "Independent federal regulator supervising Fannie Mae, Freddie Mac, and the Federal Home Loan Bank System, established in 2008. Provides publicly accessible housing finance data and APIs.",
      "url": "https://www.fhfa.gov",
      "sameAs": [
        "https://www.linkedin.com/company/fhfa",
        "https://x.com/FHFA",
        "https://github.com/fhfa"
      ]
    },
    {
      "@type": "DataCatalog",
      "@id": "https://www.fhfa.gov/data/datasets",
      "name": "FHFA Data Catalog",
      "description": "Comprehensive catalog of FHFA housing finance datasets including HPI, NMDB, PUDB, conforming loan limits, and UAD statistics.",
      "url": "https://www.fhfa.gov/data/datasets",
      "publisher": {
        "@id": "https://www.fhfa.gov"
      },
      "license": "https://www.fhfa.gov/about/fhfa-policies/api-terms-of-service",
      "dataset": [
        {
          "@type": "Dataset",
          "@id": "https://www.fhfa.gov/data/hpi",
          "name": "FHFA House Price Index (HPI)",
          "description": "Comprehensive publicly available dataset measuring changes in single-family home values across all 50 states and over 400 cities, using weighted repeat-sales methodology based on tens of millions of home sales.",
          "url": "https://www.fhfa.gov/data/hpi",
          "keywords": ["house price index", "HPI", "housing", "single-family", "repeat-sales"],
          "temporalCoverage": "1975/..",
          "spatialCoverage": "United States",
          "measurementTechnique": "Weighted repeat-sales methodology",
          "variableMeasured": [
            "House Price Index (non-seasonally adjusted)",
            "House Price Index (seasonally adjusted)"
          ],
          "distribution": [
            {
              "@type": "DataDownload",
              "encodingFormat": "text/csv",
              "contentUrl": "https://www.fhfa.gov/hpi/download/monthly/hpi_master.csv"
            },
            {
              "@type": "DataDownload",
              "encodingFormat": "application/xml",
              "contentUrl": "https://www.fhfa.gov/hpi/download/monthly/hpi_master.xml"
            }
          ]
        },
        {
          "@type": "Dataset",
          "@id": "https://www.fhfa.gov/data/nmdb",
          "name": "National Mortgage Database (NMDB)",
          "description": "Nationally representative longitudinal database of residential mortgages providing aggregate statistics on outstanding residential mortgages and mortgage originations.",
          "url": "https://www.fhfa.gov/data/nmdb",
          "keywords": ["mortgage", "NMDB", "residential", "originations", "loan characteristics"],
          "spatialCoverage": "United States"
        },
        {
          "@type": "Dataset",
          "@id": "https://www.fhfa.gov/data/pudb",
          "name": "Enterprise Public Use Database (PUDB)",
          "description": "Loan-level data on single-family and multifamily mortgages acquired by Fannie Mae and Freddie Mac, and data on Federal Home Loan Bank member institutions.",
          "url": "https://www.fhfa.gov/data/pudb",
          "keywords": ["Fannie Mae", "Freddie Mac", "GSE", "mortgage", "loan-level", "PUDB"],
          "spatialCoverage": "United States"
        },
        {
          "@type": "Dataset",
          "@id": "https://www.fhfa.gov/data/conforming-loan-limit",
          "name": "Conforming Loan Limits",
          "description": "Annual conforming loan limit (CLL) values establishing maximum mortgage amounts Fannie Mae and Freddie Mac may purchase, at the county level for all U.S. states and territories.",
          "url": "https://www.fhfa.gov/data/conforming-loan-limit",
          "keywords": ["conforming loan limit", "CLL", "Fannie Mae", "Freddie Mac", "county"],
          "spatialCoverage": "United States"
        },
        {
          "@type": "Dataset",
          "@id": "https://www.fhfa.gov/data/uad",
          "name": "Uniform Appraisal Dataset (UAD) Aggregate Statistics",
          "description": "Data on residential appraisals submitted to Fannie Mae and Freddie Mac, covering appraisal values, property characteristics, and geographic distributions.",
          "url": "https://www.fhfa.gov/data/uad",
          "keywords": ["appraisal", "UAD", "uniform appraisal", "housing", "property valuation"],
          "spatialCoverage": "United States"
        }
      ]
    }
  ]
}