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Tag
Tags are data sources emitting a stream of source messages, such as sensors,
PLCs, machines, or devices. In Manufacturing Data Engine (MDE), tags
are uniquely identified by tagName. All records in
MDE have a tagName attribute, and all
records that share the same tagName are
collectively referred to as the tag stream.
In the context of metadata, MDE features
a special class of metadata buckets called tag buckets.
The tagName serves as the natural key in tag buckets. That means, you can
attach contextual information to tag names, and metadata instances are
versioned on the tag name.
You can also change how MDE processes
records that share same tagName in the context of type versions. That means,
you can attach configuration parameters to a tagName for type versions. For
example, you can override the default type storage specifications for a
individual tags in a
type version.
Naming restrictions for Tags
A tag name can contain the following:
Letters (uppercase and lowercase), numbers and the special
characters -, !, *, .,_, ( and ).
Can be up to 255 characters long.
You can use the following regular expression for validation: ^[A-Za-z0-9\\-_\\$\\.\\!\\*\\(\\)]{1,255}$.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-28 UTC."],[],[],null,["# Tag\n===\n\nTags are data sources emitting a stream of source messages, such as sensors,\nPLCs, machines, or devices. In Manufacturing Data Engine (MDE), tags\nare uniquely identified by `tagName`. All records in\nMDE have a `tagName` attribute, and all\nrecords that share the same `tagName` are\ncollectively referred to as the *tag stream*.\n\nIn the context of metadata, MDE features\na special class of metadata buckets called [tag buckets](/manufacturing-data-engine/docs/concepts/metadata#types_of_buckets).\nThe `tagName` serves as the natural key in tag buckets. That means, you can\nattach contextual information to tag names, and metadata instances are\nversioned on the tag name.\n\nYou can also change how MDE processes\nrecords that share same `tagName` in the context of type versions. That means,\nyou can attach configuration parameters to a `tagName` for type versions. For\nexample, you can override the default type storage specifications for a\nindividual tags in a\ntype version.\n\n### Naming restrictions for Tags\n\nA tag name can contain the following:\n\n- Letters (uppercase and lowercase), numbers and the special characters `-`, `!`, `*`, `.`,`_`, `(` and `)`.\n- Can be up to 255 characters long.\n\nYou can use the following regular expression for validation: `^[A-Za-z0-9\\\\-_\\\\$\\\\.\\\\!\\\\*\\\\(\\\\)]{1,255}$`."]]
