在xml中嵌入scala代码
val books=Array("book1","book2")
val booksxml=<books><book>{books(0)}</book></bookd>
<books><book>{books(1)}</book></bookd>
booksxml.label
booksxml.child
//在xml中动态的获取元素
val bookXml=<books>{for (book <- books)yield <book>{book}</book>}</books>
//在xml属性中嵌入scala代码
<bookd id="{books(0)}">{book(0)}
</book>
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