Because the xsd says '-' is not allowed. The name of a web-fragment must be a
valid java identity name which matches the pattern
`($|_|\p{L})(\p{L}|\p{Nd}|_|$)*`
**web-fragment_3_0.xsd line 107 says:**
`<xsd:element name="web-fragment" type="javaee:web-fragmentType"> `
**web-common_3_0.xsd line 210-214 says:**
```
<xsd:complexType name="web-fragmentType">
<xsd:choice minOccurs="0"
maxOccurs="unbounded">
<xsd:element name="name"
type="javaee:java-identifierType"/>
```
**and javaee_6.xsd line 1069-1084 says:**
```
<xsd:complexType name="java-identifierType">
<xsd:annotation>
<xsd:documentation>
The java-identifierType defines a Java identifier.
The users of this type should further verify that
the content does not contain Java reserved keywords.
</xsd:documentation>
</xsd:annotation>
<xsd:simpleContent>
<xsd:restriction base="javaee:string">
<xsd:pattern value="($|_|\p{L})(\p{L}|\p{Nd}|_|$)*"/>
</xsd:restriction>
</xsd:simpleContent>
</xsd:complexType>
```
[ Full content available at:
https://github.com/apache/incubator-dubbo/pull/2470 ]
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