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https://issues.apache.org/jira/browse/MYFACES-3454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13194788#comment-13194788
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Leonardo Uribe edited comment on MYFACES-3454 at 1/27/12 2:29 PM:
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JSF 2.0 spec section 2.6.1.3 Resource Identifiers says this about libraryName :

"... The run-time must enforce the following rules to consider a 
<resourceIdentifier>s valid. A <resourceIdentifier> that does not follow these 
rules must not be considered valid and must be ignored silently.
- The set of characters that are valid for use in the localePrefix, 
libraryName, and resourceVersion segments of the resource identifier is 
specififed as XML NameChar excluding the path separator and ‘:’ characters. The 
specification for XML NameChar may be seen at 
http://www.w3.org/TR/REC-xml/#NT-NameChar.";
- A further restriction applies to libraryName. A libraryName must not be an 
underscore separated sequence of non-negative integers or a locale string. More 
rigorously, a libraryName must not match either of the following regular 
expressions:

■ [0-9]+(_[0-9]+)*
■ [A-Za-z]{2}(_[A-Za-z]{2}(_[A-Za-z]+)*)?

..."

so any libraryName that contain slashes like in the example (components/mycomp) 
is considered invalid. 
                
      was (Author: lu4242):
    JSF 2.0 spec section 2.1.6.3 says this about libraryName :

"... The run-time must enforce the following rules to consider a 
<resourceIdentifier>s valid. A <resourceIdentifier> that does not follow these 
rules must not be considered valid and must be ignored silently.
- The set of characters that are valid for use in the localePrefix, 
libraryName, and resourceVersion segments of the resource identifier is 
specififed as XML NameChar excluding the path separator and ‘:’ characters. The 
specification for XML NameChar may be seen at 
http://www.w3.org/TR/REC-xml/#NT-NameChar.";
- A further restriction applies to libraryName. A libraryName must not be an 
underscore separated sequence of non-negative integers or a locale string. More 
rigorously, a libraryName must not match either of the following regular 
expressions:

■ [0-9]+(_[0-9]+)*
■ [A-Za-z]{2}(_[A-Za-z]{2}(_[A-Za-z]+)*)?

..."

so any libraryName that contain slashes like in the example (components/mycomp) 
is considered invalid. 
                  
> composite component is not rendered anymore with 2.1.6-SNAPSHOT
> ---------------------------------------------------------------
>
>                 Key: MYFACES-3454
>                 URL: https://issues.apache.org/jira/browse/MYFACES-3454
>             Project: MyFaces Core
>          Issue Type: Bug
>    Affects Versions: 2.1.6-SNAPSHOT
>            Reporter: Rene O
>            Assignee: Leonardo Uribe
>            Priority: Blocker
>         Attachments: jsftest.war
>
>
> If you use myfaces 2.1.6-SNAPSHOT, a composite component is not rendered 
> correctly anymore. With myfaces-2.1.5 everything is ok.
> A testcase to reproduce this issue is attached.
> http://localhost:8080/jsftest/componenttest.jsf

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