How to set the alt attribute for h:graphicImage?

问题

I define a image in my JSF application:

<h:graphicImage library="myPath" name="myImg"/> 

As result my HTML output:

<img src="bla-bla-bla" alt="" />

It works properly but I have a question. How to set the attribute alt for HTML tag img in this case? For example

<h:graphicImage library="myPath" name="myImg" alt="myText"/> 

doesn't work...

来源：https://stackoverflow.com/questions/10897493/how-to-set-the-alt-attribute-for-hgraphicimage