# Component: Id

## Simple Type Id

| Namespace | http://schemas.google.com/dspl/2010 |
| Annotations | A global identifier used in the dataset (for concepts, slices and topics). The length of global identifiers is limited to 64 characters. No value can appear twice as a global identifier in a dataset. |
| Diagram | ![Diagram](https://developers.google.com/static/public-data/images/schema/dspl.html5.jpeg) |
| Type | restriction of xs:ID |
| Facets | | maxLength | 64 |   | |---|---|---| |
| Used by | | Attributes | [Concept/@id](https://developers.google.com/public-data/docs/schema/dspl6#id66), [Slice/@id](https://developers.google.com/public-data/docs/schema/dspl2#id85), [Table/@id](https://developers.google.com/public-data/docs/schema/dspl10#id102), [Topic/@id](https://developers.google.com/public-data/docs/schema/dspl15#id32) | |---|---| |
| Source | ``` <xs:simpleType name="Id"> <xs:annotation> <xs:documentation>A global identifier used in the dataset (for concepts, slices and topics). The length of global identifiers is limited to 64 characters. No value can appear twice as a global identifier in a dataset.</xs:documentation> </xs:annotation> <xs:restriction base="xs:ID"> <xs:maxLength value="64"/> </xs:restriction> </xs:simpleType> ``` |
|---|---|

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