<p:xslt>的馈送输出进入<c:body>Xproc 中的 HTTP PUT 请求 [英] Feeding output of <p:xslt> into <c:body> of HTTP PUT request in Xproc

问题描述

我下面的 Xproc 管道的目标是接收源 XML 文档，使用 <p:xslt> 步骤运行 2 个 XSLT 转换，然后在第二个 之后提供输出 XML<p:xslt> 到 步骤的 :

My goal for my Xproc pipeline below is to take in a source XML document, run 2 XSLT transforms with <p:xslt> steps, then feed the output XML after the 2nd <p:xslt> to the <c:body> of the <p:http-request> step:

<p:declare-step xmlns:p="http://www.w3.org/ns/xproc"
    xmlns:c="http://www.w3.org/ns/xproc-step"
    version="1.0">

  <p:input port="source" primary="true"/>
  <p:output port="result" primary="true"/>

  <p:serialization port="result" 
                   indent="false" 
                   method="xml" 
                   encoding="utf-8" 
                   omit-xml-declaration="false"
                   doctype-system="myDTD.dtd" 
                   doctype-public="-//DOCTYPE-HERE"/>

  <p:xslt>
    <p:input port="stylesheet">
      <p:document href="XSLT-1.xslt"/>
    </p:input>
  </p:xslt>

  <p:xslt>
    <p:input port="stylesheet">
      <p:document href="XSLT-2.xslt"/>
    </p:input>
  </p:xslt>

  <p:http-request omit-xml-declaration="false" 
                  encoding="UTF-8">
    <p:input port="source">
      <p:inline>
        <c:request href="http://localhost:80/myRESTserver/dburi/myDOC.xml" 
                   auth-method="basic" 
                   username="user" 
                   password="admin" 
                   method="put">
          <c:body content-type="text/xml" >

          </c:body>
        </c:request>
      </p:inline>
    </p:input>
  </p:http-request>

有没有办法实现这一目标?当我尝试按原样执行此代码时，首先调用 <p:http-request>(将一个空的 XML 文件放入数据库).

Is there a way to achieve this? When I try executing this code as is, the <p:http-request> is invoked first (PUTS an empty XML file into the database).

推荐答案

p:http-request 首先运行的原因是它不依赖于管道中的任何其他步骤.p:http-request 的source 输入端口绑定到一个静态内联c:request 文档，因此该步骤不需要等待对于任何其他步骤要先完成.因此，该步骤可以随时运行.

The reason why p:http-request runs first is that it does not depend on any other steps in the pipeline. The source input port of p:http-request is bound to a static inline c:request document and therefore the step does not need to wait for any other steps to finish first. The step can therefore run at any time.

要解决这个问题，您需要将 p:http-request 的输入端口连接到第二个 p:xslt 步骤.这可以显式地(使用p:pipe)或隐式地完成(依赖于XProc 处理器将自动制造隐含的p:pipe 连接这一事实).让我们在解决您的主要问题(在 c:body 中嵌入 p:xslt 的输出)的同时进行演示:

To fix that, you need to connect the input port of p:http-request to the second p:xslt step. This can be done explicitly (using p:pipe) or implicitly (relying on the fact that the XProc processor will manufacture implied p:pipe connections automatically). Let's demonstrate both while solving your main question (embedding the output of p:xslt in c:body) in the process:

为了在 XML 包装器中嵌入 XML 内容，通常的 XProc 步骤是 p:wrap 和 p:wrap-sequence.但是，它们使用简单的(一级)XML 包装器元素，因此如果您想包装多级 XML(如您的情况:c:request/c:body).所以你必须使用其他东西 - 例如 p:insert 步骤:

For embedding XML content in XML wrappers, the usual go-to XProc steps are p:wrap and p:wrap-sequence. However, they work with simple (one level) XML wrapper elements, so they are not all that helpful if you want to wrap in multiple levels of XML (as in your case: c:request/c:body). So you have to use something else - for example the p:insert step:

...
<p:xslt name="xslt2">
  <p:input port="stylesheet">
    <p:document href="XSLT-2.xslt"/>
  </p:input>
</p:xslt>
<p:insert match="c:request/c:body" position="first-child">
  <p:input port="source">
    <p:inline>
      <c:request href="http://localhost:80/myRESTserver/dburi/myDOC.xml" 
                 auth-method="basic" 
                 username="user" 
                 password="admin" 
                 method="put">
        <c:body content-type="text/xml">
        </c:body>
      </c:request>
    </p:inline>
  </p:input>
  <p:input port="insertion">
    <p:pipe step="xslt2" port="result"/>
  </p:input>
</p:insert>
<p:http-request omit-xml-declaration="false"
                encoding="UTF-8"/>
...

让我们看看它的作用:

1. 我们为第二个 p:xslt 步骤命名(xslt2).
2. 我们在第二个 p:xslt 步骤和 p:http-request 步骤之间放置了一个 p:identity 步骤.p:identity 步骤使用静态 c:request/c:body 文档作为插入目标，并将名为 xslt2 的步骤的输出作为要插入的内容.它将内容作为 c:request/c:body 的第一个子元素插入.
3. 我们从 p:http-request 的 source 输入端口移除了静态连接.这很好，因为 p:insert 步骤的输出会自动流入 p:http-request 的 source 输入端口.立>

1. We gave the second p:xslt step a name (xslt2).
2. We placed an p:identity step in between the second p:xslt step and the p:http-request step. The p:identity step uses a static c:request/c:body document as the insertion target and the output of the step named xslt2 as the content to be inserted. It inserts the content as the first child of c:request/c:body.
3. We removed the static connection from the source input port of the p:http-request. This is fine because the output of the p:insert step will flow into the source input port of p:http-request automatically.

这篇关于<p:xslt>的馈送输出进入<c:body>Xproc 中的 HTTP PUT 请求的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！