> ## Documentation Index
> Fetch the complete documentation index at: https://docs.helix.ax/llms.txt
> Use this file to discover all available pages before exploring further.

# Classification Dimensions

> The four semantic questions that organize Helix classification.

Helix separates classification into four dimensions. Each dimension asks a
different question about the same analysis unit.

| Dimension | Question                                                 | Typical unit                        |
| --------- | -------------------------------------------------------- | ----------------------------------- |
| Entity    | What bounded meaning appears here?                       | A text span or region               |
| Topic     | What is this content about?                              | An analysis unit or document        |
| Document  | What kind of artifact is this?                           | A complete document or work product |
| Relation  | What explicit connection holds between two observations? | An anchored observation pair        |

## Why the dimensions stay separate

An email address is an Entity. An email message is a Document. A discussion of
cybersecurity is a Topic. A statement that an employee works for a company can
express a Relation.

Collapsing these meanings into one label list would create ambiguous results.
Keeping them distinct lets each task use the prediction unit and geometry
appropriate to its question while preserving one coherent semantic system.

## Hierarchy preserves useful precision

Concepts can progress from broad to specific. Evidence should resolve to the
deepest meaning it supports, while broader ancestors remain available for
navigation and interpretation. A system must not invent a more specific child
when the evidence supports only the parent.

## Meaning is not availability

A semantic concept can exist before a particular Helix product surface supports
detecting it. Public capability claims therefore require separate qualification;
they are never inferred from the breadth of the underlying specification.

<Note>
  Classification describes what the available evidence supports. Customer policy
  determines whether that meaning is sensitive for a particular use and what
  action, if any, should follow.
</Note>