它指定由XML实例文档引用的统一资源指示符(uri)。
It specifies the uniform resource indicator (URI) referenced by XML instance documents.
但是使用双引号允许在分隔的字符串内部对Velocity引用、指示符甚至Velocimacros求值。
However, the use of double quotation marks allows evaluation of Velocity references, directives, or even Velocimacros inside the delimited string.
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