serializer/src/main/java/org/apache/xml/serializer/utils/SystemIDResolver.java [114:147]:
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  public static boolean isAbsoluteURI(String systemId)
  {
     /** http://www.ietf.org/rfc/rfc2396.txt
      *   Authors should be aware that a path segment which contains a colon
      * character cannot be used as the first segment of a relative URI path
      * (e.g., "this:that"), because it would be mistaken for a scheme name.
     **/
     /** 
      * %REVIEW% Can we assume here that systemId is a valid URI?
      * It looks like we cannot ( See discussion of this common problem in 
      * Bugzilla Bug 22777 ). 
     **/
     //"fix" for Bugzilla Bug 22777
    if(isWindowsAbsolutePath(systemId)){
        return false;
     }
    
    final int fragmentIndex = systemId.indexOf('#');
    final int queryIndex = systemId.indexOf('?');
    final int slashIndex = systemId.indexOf('/');
    final int colonIndex = systemId.indexOf(':');
    
    //finding substring  before '#', '?', and '/' 
    int index = systemId.length() -1;
    if(fragmentIndex > 0) 
        index = fragmentIndex;
    if((queryIndex > 0) && (queryIndex <index)) 
        index = queryIndex;
    if((slashIndex > 0) && (slashIndex <index))
        index = slashIndex; 
    // return true if there is ':' before '#', '?', and '/'
    return ((colonIndex >0) && (colonIndex<index));
    
  }
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xalan/src/main/java/org/apache/xml/utils/SystemIDResolver.java [107:140]:
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  public static boolean isAbsoluteURI(String systemId)
  {
     /** http://www.ietf.org/rfc/rfc2396.txt
      *   Authors should be aware that a path segment which contains a colon
      * character cannot be used as the first segment of a relative URI path
      * (e.g., "this:that"), because it would be mistaken for a scheme name.
     **/
     /** 
      * %REVIEW% Can we assume here that systemId is a valid URI?
      * It looks like we cannot ( See discussion of this common problem in 
      * Bugzilla Bug 22777 ). 
     **/
     //"fix" for Bugzilla Bug 22777
    if(isWindowsAbsolutePath(systemId)){
        return false;
     }
    
    final int fragmentIndex = systemId.indexOf('#');
    final int queryIndex = systemId.indexOf('?');
    final int slashIndex = systemId.indexOf('/');
    final int colonIndex = systemId.indexOf(':');
    
    //finding substring  before '#', '?', and '/' 
    int index = systemId.length() -1;
    if(fragmentIndex > 0) 
        index = fragmentIndex;
    if((queryIndex > 0) && (queryIndex <index)) 
        index = queryIndex;
    if((slashIndex > 0) && (slashIndex <index))
        index = slashIndex; 
    // return true if there is ':' before '#', '?', and '/'
    return ((colonIndex >0) && (colonIndex<index));
    
  }
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