</> Web Validators

Full Schema Hierarchy

Browse every schema.org type: what it inherits from, what inherits from it, and every property it accepts.

Built from schema.org's own machine-readable release -- 939 types and 1538 properties, version 30.1 -- and served from a committed copy, so it works whether or not schema.org is reachable. Each property is shown with the type it was declared on, which is the part that is hard to see on the official hierarchy page.

Based on: Schema.org · Schema.org — Full Hierarchy

About this validation

Browses the schema.org type hierarchy from a committed copy of schema.org's own machine-readable release: supertypes, subtypes, and the properties a type accepts including everything it inherits.

Rules reviewed:
Nov 15, 2026

SEOTechTests methodology: Serves schema.org's type hierarchy from a copy of its own machine-readable release that is generated by a script in this repository and committed, so the page never depends on schema.org being reachable. Supertypes are flattened breadth-first, and the property list for a type is everything declared on it plus everything inherited.

Standards and vendor-documented behavior can change. This reflects the source as last reviewed above, not a permanent guarantee.

MolecularEntity

Any constitutionally or isotopically distinct atom, molecule, ion, ion pair, radical, radical ion, complex, conformer etc., identifiable as a separately distinguishable entity.

schema.org/MolecularEntity35 properties0 subtypesin the pending area, not the core vocabulary

Inheritance

Thing→BioChemEntity→MolecularEntity

Properties declared on MolecularEntity (9)

chemicalRoleDefinedTermA role played by the BioChemEntity within a chemical context.
inChITextNon-proprietary identifier for molecular entity that can be used in printed and electronic data sources thus enabling easier linking of diverse data compilations.
inChIKeyTextInChIKey is a hashed version of the full InChI (using the SHA-256 algorithm).
iupacNameTextSystematic method of naming chemical compounds as recommended by the International Union of Pure and Applied Chemistry (IUPAC).
molecularFormulaTextThe empirical formula is the simplest whole number ratio of all the atoms in a molecule.
molecularWeightQuantitativeValue, TextThis is the molecular weight of the entity being described, not of the parent.
monoisotopicMolecularWeightQuantitativeValue, TextThe monoisotopic mass is the sum of the masses of the atoms in a molecule using the unbound, ground-state, rest mass of the principal (most abundant) isotope for each element in...
potentialUseDefinedTermIntended use of the BioChemEntity by humans.
smilesTextA specification in form of a line notation for describing the structure of chemical species using short ASCII strings.

Inherited properties (26)

additionalTypefrom ThingText, URLAn additional type for the item, typically used for adding more specific types from external vocabularies in microdata syntax.
alternateNamefrom ThingTextAn alias for the item.
associatedDiseasefrom BioChemEntityMedicalCondition, PropertyValue, URLDisease associated to this BioChemEntity.
bioChemInteractionfrom BioChemEntityBioChemEntityA BioChemEntity that is known to interact with this item.
bioChemSimilarityfrom BioChemEntityBioChemEntityA similar BioChemEntity, e.g., obtained by fingerprint similarity algorithms.
biologicalRolefrom BioChemEntityDefinedTermA role played by the BioChemEntity within a biological context.
descriptionfrom ThingText, TextObjectA description of the item.
disambiguatingDescriptionfrom ThingTextA sub property of description.
fundingfrom BioChemEntityGrantA Grant that directly or indirectly provide funding or sponsorship for this item.
hasBioChemEntityPartfrom BioChemEntityBioChemEntityIndicates a BioChemEntity that (in some sense) has this BioChemEntity as a part.
hasMolecularFunctionfrom BioChemEntityDefinedTerm, PropertyValue, URLMolecular function performed by this BioChemEntity; please use PropertyValue if you want to include any evidence.
hasRepresentationfrom BioChemEntityPropertyValue, Text, URLA common representation such as a protein sequence or chemical structure for this entity.
identifierfrom ThingPropertyValue, Text, URLThe identifier property represents any kind of identifier for any kind of Thing, such as ISBNs, GTIN codes, UUIDs etc.
imagefrom ThingImageObject, URLAn image of the item.
isEncodedByBioChemEntityfrom BioChemEntityGeneAnother BioChemEntity encoding by this one.
isInvolvedInBiologicalProcessfrom BioChemEntityDefinedTerm, PropertyValue, URLBiological process this BioChemEntity is involved in; please use PropertyValue if you want to include any evidence.
isLocatedInSubcellularLocationfrom BioChemEntityDefinedTerm, PropertyValue, URLSubcellular location where this BioChemEntity is located; please use PropertyValue if you want to include any evidence.
isPartOfBioChemEntityfrom BioChemEntityBioChemEntityIndicates a BioChemEntity that is (in some sense) a part of this BioChemEntity.
mainEntityOfPagefrom ThingCreativeWork, URLIndicates a page (or other CreativeWork) for which this thing is the main entity being described.
namefrom ThingTextThe name of the item.
ownerfrom ThingOrganization, PersonA person or organization who owns this Thing.
potentialActionfrom ThingActionIndicates a potential Action, which describes an idealized action in which this thing would play an 'object' role.
sameAsfrom ThingURLURL of a reference Web page that unambiguously indicates the item's identity.
subjectOffrom ThingCreativeWork, EventA CreativeWork or Event about this Thing.
taxonomicRangefrom BioChemEntityDefinedTerm, Taxon, Text, URLThe taxonomic grouping of the organism that expresses, encodes, or in some way related to the BioChemEntity.
urlfrom ThingURLURL of the item.

FAQ

Where does this hierarchy come from?

From schema.org's published machine-readable vocabulary, condensed to the type and property relations and committed to this site. The release version it was built from is shown with the results.[1, 2]

Why does a type list properties it does not declare?

Because it inherits them. Every type ultimately descends from Thing, so name, url, description and image are available everywhere without being declared on each type.[1]

What do pending and attic mean next to a type?

schema.org keeps proposed terms in a pending area before they join the core vocabulary, and moves retired ones to an attic so old markup still resolves. A term in either is real, but not part of the core vocabulary.[1]