# Tags **Tag** represents the area of device data identified by the specific address. Address identifies the data type and the dimension (scalar or array). Tags are organized in a hierarchy, which forms the objects structure of the OPC UA items, where the folder is a group of tags, and a variable is a tag. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.monokot.io/tags-and-devices/tags.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.