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---
title: What YAML features does StrictYAML remove?
---
StrictYAML restricts you from parsing a number of things which
the YAML specification says should be parsed. An issue has
been [raised](https://github.com/yaml/YAML2/issues/8) by
[David Seaward](https://github.com/lofidevops) about this critique
on the official YAML repository.
This document lists those of those features:
## Implicit Typing ([Why?](../why/implicit-typing-removed))
```yaml
x: yes
y: null
```
Example pyyaml/ruamel/poyo:
```python
load(yaml) == {"x": True, "y": None}
```
Example StrictYAML without schema:
```python
load(yaml) == {"x": "yes", "y": "null"}
```
Example StrictYAML with schema:
```python
load(yaml, Map({"x": Bool(), "y": Str()})) == {"x": True, "y": "null"}
```
## Direct representations of objects ([Why?](../why/not-parse-direct-representations-of-python-objects))
```yaml
--- !python/hash:UnsafeUserObject
email: evilhacker@hacker.com
password: passwordtoset
type: admin
```
Example pyyaml/ruamel:
```python
load(yaml) == {'evil': b'z\xf8\xa5u\xabZ'}
```
Example StrictYAML
```python
raises TagTokenDisallowed
```
## Duplicate Keys Disallowed ([Why?](../why/duplicate-keys-disallowed))
```yaml
x: 1
x: 2
```
Example pyyaml/poyo:
```python
load(yaml) == {'x': 2}
```
Example StrictYAML
```python
raises DuplicateKeysDisallowed
```
## Explicit tags ([Why?](../why/explicit-tags-removed))
```yaml
x: !!int 5
```
Example pyyaml/ruamel/poyo:
```python
load(yaml) == load(yaml) == {"x": 5}
```
Example StrictYAML
```python
raises TagTokenDisallowed
```
## Node anchors and refs ([Why?](../why/node-anchors-and-references-removed))
```yaml
x: &id001
a: 1
y: *id001
```
Example pyyaml/ruamel/poyo:
```python
load(yaml) == {'x': {'a': 1}, 'y': {'a': 1}}
```
Example StrictYAML
```python
raises NodeAnchorDisallowed
```
To parse the above YAML *literally* in StrictYAML do:
```yaml
x: '&id001'
a: 1
y: '*id001'
```
## Flow style ([Why?](../why/flow-style-removed))
```yaml
x: 1
b: {c: 3, d: 4}
```
Example pyyaml/ruamel/poyo:
```python
load(yaml) == {'x': 1, 'b': {'c': 3, 'd': 4}}
```
Example StrictYAML
```python
raises FlowStyleDisallowed
```
|
