PropertyValue Schema

A property-value pair, e.g. representing a feature of a product or place...

Properties of Property­ValueExpected TypeDescription
max­Value The upper value of some characteristic or property.
measurement­Technique  or A technique or technology used in a Dataset (or Data­Download, Data­Catalog), corresponding to the method used for measuring the corresponding variable(s) (described using variable­Measured ). This is oriented towards scientific and scholarly dataset publication but may have broader applicability; it is not intended as a full representation of measurement, but rather as a high level summary for dataset discovery.

For example, if variable­Measured  is: molecule concentration, measurement­Technique  could be: "mass spectrometry" or "nmr spectroscopy" or "colorimetry" or "immunofluorescence".

If the variable­Measured  is "depression rating", the measurement­Technique  could be "Zung Scale" or "HAM-D" or "Beck Depression Inventory".

If there are several variable­Measured  properties recorded for some given data object, use a Property­Value for each variable­Measured  and attach the corresponding measurement­Technique .
min­Value The lower value of some characteristic or property.
property­ID  or A commonly used identifier for the characteristic represented by the property, e.g. a manufacturer or a standard code for a property. property­ID can be (1) a prefixed string, mainly meant to be used with standards for product properties; (2) a site-specific, non-prefixed string (e.g. the primary key of the property or the vendor-specific id of the property), or (3) a URL indicating the type of the property, either pointing to an external vocabulary, or a Web resource that describes the property (e.g. a glossary entry). Standards bodies should promote a standard prefix for the identifiers of properties from their standards.
unit­Code  or The unit of measurement given using the UN/CEFACT Common Code (3 characters) or a URL. Other codes than the UN/CEFACT Common Code may be used with a prefix followed by a colon.
unit­Text A string or text indicating the unit of measurement. Useful if you cannot provide a standard unit code for unit­Code .
value  or The value of the quantitative value or property value node.

  • For Quantitative­Value and Monetary­Amount, the recommended type for values is 'Number'.
  • For Property­Value, it can be 'Text;', 'Number', 'Boolean', or 'Structured­Value'.
  • Use values from 0123456789 (Unicode 'DIGIT ZERO' (U+0030) to 'DIGIT NINE' (U+0039)) rather than superficially similiar Unicode symbols.
  • Use '.' (Unicode 'FULL STOP' (U+002E)) rather than ',' to indicate a decimal point. Avoid using these symbols as a readability separator.
value­Reference  or A pointer to a secondary value that provides additional information on the original value, e.g. a reference temperature.
Properties inherited from ThingExpected TypeDescription
additional­Type An additional type for the item, typically used for adding more specific types from external vocabularies in microdata syntax. This is a relationship between something and a class that the thing is in. In RDFa syntax, it is better to use the native RDFa syntax - the 'typeof' attribute - for multiple types. tools may have only weaker understanding of extra types, in particular those defined externally.
alternate­Name An alias for the item.
description A description of the item.
disambiguating­Description A sub property of description. A short description of the item used to disambiguate from other, similar items. Information from other properties (in particular, name) may be necessary for the description to be useful for disambiguation.
identifier  or The identifier property represents any kind of identifier for any kind of Thing, such as ISBNs, GTIN codes, UUIDs etc. provides dedicated properties for representing many of these, either as textual strings or as URL (URI) links. See background notes  for more details.
image  or An image of the item. This can be a URL or a fully described Image­Object.
main­Entity­Of­Page  or Indicates a page (or other Creative­Work) for which this thing is the main entity being described. See background notes  for details.
name The name of the item.
potential­Action Indicates a potential Action, which describes an idealized action in which this thing would play an 'object' role.
same­As URL of a reference Web page that unambiguously indicates the item's identity. E.g. the URL of the item's Wikipedia page, Wikidata entry, or official website.
subject­Of  or A Creative­Work or Event about this Thing.
url URL of the item.