valid-items-collection-format
Overview
This rule belongs to the swagger-v2-standards-validation ruleset and states that: 
The collectionFormat value determines the format of the array for items of type array. This must have one of the following possible values only: csv, ssv, tsv, or pipes only.
| Property | Value | 
|---|---|
| Enabled | Yes | 
| Maximum Severity | Error | 
| Message | Invalid collectionFormat value found. | 
| Code | SWAGGER20STANDARDS_V153 | 
| Type | Validation | 
| Rule System | Semantic | 
| Broad Category | Array Items | 
| Products Impacted | API Transformer, Code Generation, Developer Experience Portal | 
| Tags | swagger2 swagger standards semantic validation items object type array | 
Suggested Fixes
- Ensure that the value of the 
collectionFormatproperty is one of the following values with no typos:csv,ssv,tsv, orpipes. - The format values are compared in a case-sensitive manner.