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---
title: Revalidate an already validated document
---
When parsing a YAML document you may wish to do more than one validation
pass over a document.
This is needed when:
* It simplifies your code to apply validation in stages.
* You want to validate recursively.
* One part of the document validation depends upon another (this is the example given below).
Example yaml_snippet:
```yaml
capitals:
UK: 1
Germany: 2
countries:
- Germany
- UK
```
```python
from strictyaml import Str, Int, Map, Seq, Any, load
from ensure import Ensure
overall_schema = Map({"capitals": Any(), "countries": Seq(Str())})
parsed = load(yaml_snippet, overall_schema)
```
Reparse mapping:
```python
Ensure(parsed.data['capitals']['UK']).equals("1")
parsed['capitals'].revalidate(Map({capital: Int() for capital in parsed.data['countries']}))
Ensure(parsed.data['capitals']['UK']).equals(1)
```
Reparse scalar:
```python
Ensure(parsed.data['capitals']['UK']).equals("1")
parsed['capitals']['UK'].revalidate(Int())
Ensure(parsed.data['capitals']['UK']).equals(1)
Ensure(parsed['capitals']['UK'].data).is_an(int)
```
Parse error:
```yaml
capitals:
UK: 1
Germany: 2
France: 3
countries:
- Germany
- UK
```
```python
parsed['capitals'].revalidate(Map({capital: Int() for capital in parsed.data['countries']}))
```
```python
strictyaml.exceptions.YAMLValidationError:
while parsing a mapping
unexpected key not in schema 'France'
in "<unicode string>", line 4, column 1:
France: '3'
^ (line: 4)
```
!!! note "Executable specification"
Documentation automatically generated from
<a href="https://github.com/crdoconnor/strictyaml/blob/master/hitch/story/revalidation.story">revalidation.story
storytests.
|
