---
title: "Enumeration Facets | Microsoft Docs"
ms.custom: ""
ms.date: "03/14/2017"
ms.prod: sql
ms.prod_service: "database-engine"
ms.reviewer: ""
ms.technology: xml
ms.topic: conceptual
helpviewer_keywords: 
  - "enumeration facets"
ms.assetid: dec23a79-ddd6-4701-9721-55a2c435a34d
author: MightyPen
ms.author: genemi
---
# Enumeration Facets
[!INCLUDE[appliesto-ss-asdb-xxxx-xxx-md](../../includes/appliesto-ss-asdb-xxxx-xxx-md.md)]
  [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)] rejects XML schemas with types that have pattern facets or enumerations that violate those facets.  
  
## Example  
 The following schema would be rejected, because the featured enumeration value includes a mixed-case value. It would also be rejected because this value violates the pattern value that limits values to only lowercase letters.  
  
```  
CREATE XML SCHEMA COLLECTION MySampleCollection AS '  
<schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="http://ns" xmlns:ns="http://ns">  
    <simpleType name="MyST">  
       <restriction base="string">  
          <pattern value="[a-z]*"/>  
       </restriction>  
    </simpleType>  
  
    <simpleType name="MyST2">  
       <restriction base="ns:MyST">  
           <enumeration value="mYstring"/>  
       </restriction>  
    </simpleType>  
</schema>'  
GO  
```  
  
## See Also  
 [Requirements and Limitations for XML Schema Collections on the Server](../../relational-databases/xml/requirements-and-limitations-for-xml-schema-collections-on-the-server.md)