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# USDPrim.PseudoRootSpec

A handle to a layer’s pseudo-root — the implicit parent of all top-level
prims in a layer.

```
struct PseudoRootSpec
```

## Overview

The pseudo-root is a special spec that’s automatically created by every
layer. It’s not authored as a prim in the file, but it conceptually
owns the top-level prims. It conforms to `USDLayer.Spec.MetadataCollection`
and `USDLayer.Spec.FieldCollection`.

## Topics

### Initializers

[`init()`](/documentation/USDKit/USDPrim/PseudoRootSpec/init())

Creates an empty (invalid) pseudo-root spec handle.

[`init?(USDLayer.Spec)`](/documentation/USDKit/USDPrim/PseudoRootSpec/init(_:))

Narrows an untyped [`USDLayer.Spec`](/documentation/USDKit/USDLayer/Spec) to a pseudo-root spec.

## Relationships

### Conforms To

[`Copyable`](/documentation/Swift/Copyable)

[`MetadataCollection`](/documentation/USDKit/USDLayer/Spec/MetadataCollection)

[`Equatable`](/documentation/Swift/Equatable)

[`Escapable`](/documentation/Swift/Escapable)

[`FieldCollection`](/documentation/USDKit/USDLayer/Spec/FieldCollection)

---

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