# {{page-title}}

This filter allows you to filter a resource on a FhirPath predicate. That means that only files for which the FhirPath statement is true,
remain in your selection. 
- Any FhirPath statement that results in an unambiguous true or false
- Any FhirPath statement that results in a single value (if the value is there, it's a match)

QC currently supports FhirPath v2.0.0. For more information about FhirPath, see the [FhirPath standard](http://hl7.org/fhirpath/).

### Examples:
An example true/false expression. 
```
This will select all files that have an id.
- filter: id.exists()
```
An example of a existence match:
```
# Resources that have a meta.profile field:
- meta.profile
```
Resource types are a valid FhirPath expression. So This wil select all Patient resources.
```
- filter: Patient
```