# XML报文 ## **概述** XML报文规则遵循XML语法规范，例如如下XML报文： ``` <pre class="calibre29">``` <span class="token"><</span><span class="token">?</span>xml version<span class="token">=</span><span class="token3">"1.0"</span> encoding<span class="token">=</span><span class="token3">"GBK"</span><span class="token">?</span><span class="token">></span> <span class="token"><</span>A<span class="token">></span> <span class="token"><</span>fieldname1<span class="token">></span><span class="token">--</span><span class="token">-</span> this is fixed content<span class="token"><</span><span class="token">/</span>fieldname1<span class="token">></span> <span class="token"><</span>B<span class="token">></span> <span class="token"><</span>transcode<span class="token">></span><span class="token2">2000</span><span class="token"><</span><span class="token">/</span>transcode<span class="token">></span> <span class="token"><</span>fixedfieldname2<span class="token">></span><span class="token2">2</span><span class="token"><</span><span class="token">/</span>fixedfieldname2<span class="token">></span> <span class="token"><</span><span class="token">/</span>B<span class="token">></span> <span class="token"><</span><span class="token">/</span>A<span class="token">></span> ``` ``` XML报文是根据路径进行解析的，例如我们要访问交易码信息，那么我们访问的路径xpath为：/A/B/transcode ## **配置**  1. XML报文配置中“xpath”为“/”时表示解包常量，以“/”开始的节点表示使用绝对路径解包或组包XML，否则视为使用相对路径（即相对上级节点配置的路径）。XML中若需要获取属性值则XPATH需配置为XPATH/@属性名。 2. XML报文解包或组循环报文的循环次数由XPATH或上下文LIST中的记录数决定