| Name | Kind | Description |
| KeepsakeCategoryCode | class instance | A kind of item collected as a hobby or given in friendship. |
| KeepsakeCategoryCodeSimpleType | class | A data type for a code that identifies items collected as a hobby or given in friendship. |
| KeepsakeCategoryCodeType | class | A data type for a code that identifies items collected as a hobby or given in friendship. |
| KeyHistoryObject | class instance | A data element for the retired Key Management private keys |
| KeyInfo | class instance | Symmetric or asymmetric keys used to encrypt and decrypt, or verify signed messages or documents exchanged with the court. |
| KeyInfoType | class | |
| Kit | class instance | A set of tools, supplies, instructional matter, or other materials collected for a specific purpose. |
| KnifeCategoryCode | class instance | A kind of knife. |
| KnifeCategoryCodeSimpleType | class | A data type for a code that identifies a kind of knife. |
| KnifeCategoryCodeType | class | A data type for a code that identifies a kind of knife. |
| KnotPropertyType | class | gml:KnotPropertyType encapsulates a knot to use it in a geometric type. |
| KnotType | class | |
| KnotTypesType | class | This enumeration type specifies values for the knots' type (see ISO 19107:2003, 6.4.25). |
| KnownEnemyAssociation | class instance | A relationship between people who are known enemies. |