category-attribute

schema/components/category-attribute/1.1.0/category-attribute.schema.json

A category attribute assigns categorical labels to geometric elements. It uses attribute_type = "category".

Values are stored as integers that index into a lookup table (via category-data):

table — A lookup table mapping integer indices to category names.
values — Integer indices into the lookup table, one per geometric element.
nan_description — A nan-categorical component defining how NaN values are interpreted.

Used by: channel-attribute, one-of-attribute.

Properties

An attribute that describes a category.

Property	Type	Description	Flags
name	String	The name of the attribute	⬆️ ✅
key	String	An identifier of the attribute, used to keep track of the attribute when it is renamed.
The identifier must be unique within an attribute list.	⬆️ ✅
attribute_type	String	Type of the attribute.	⬆️ ✅
attribute_description	category-attribute-description	The attribute description record.	⬆️
table	lookup-table	Lookup table associated with the attributes.	⬆️ ✅
values	integer-array-1	The index values of the attributes.	⬆️ ✅
attribute_type	String		✅
nan_description	nan-categorical	Describes the values used to designate not-a-number.	✅

Flag	Description
⬆️	Inherited property
✅	Required property