What to fill in the Microdata property field?

[Alfa1]

Its clear to me that this field is to define the microdata from schema.org
I know which microdata schema I want to use, but it's unclear to me what I need to fill in exactly. The text can use some clarification.
For example if I want to use:
https://schema.org/Taxon
Do I fill in:
Taxon

or
Thing>Taxon

Or something else?

[pegasus]

If you want to use Taxon, what property of Taxon does your custom field satisfy?
By choosing Taxon, when a page has a value for your custom field, the page will have an additionalType of Taxon added to its Article type.

Taxon has a field called hasDefinedTerm that takes a DefinedTerm type as its value. Your custom field could say:
hasDefinedTerm:DefinedTerm > termCode

This means that when your custom field has a value set, the article becomes a Taxon, and the custom field value is used as the termCode of its hasDefinedTerm property.

[Alfa1]

To elaborate: If we have a page about a Person and a field for Birthdate, then these would be suitable Schema's:
https://schema.org/Person
https://schema.org/birthDate

So should the field state:
birthDate:Date > Person
Or
birthDate:Date > termcode