Re: Construct an XdmMap from JSON file (for use as XQuery context item)

Andreas Sewe <andreas_sewe-+IBl0H0C+Lsf95zv9F5CbQC/[email protected]> Tue, 4 Aug 2020 17:01:03 +0200

Newsgroups	gmane.text.xml.saxon.help
Message-ID	<[email protected]>

Michael Kay wrote:
> No, there's no equivalent to the DocumentBuilder at the s9api level. One
> approach is simply to issue a query that invokes fn:json-doc() on a URI
> supplied as a parameter. 

Yes, in most cases that would work, but in my case I need to bind the
JSON content to the query's context item.

Essentially, I am implementing a Maven plug-in modeled on the
xml-maven-plugin's transform goal [1], only for XQuery. Something like
the following:

  <plugin>
    <artifactId>xquery-maven-plugin</artifactId>
    <executions>
      <execution>
        <goals>
          <goal>query</goal>
        </goals>
      </execution>
    </executions>
    <configuration>
      <querySets>
        <querySet>
          <mainModule>src/main/xquery/query-xml.xq</mainModule>
          <includes>
            <include>**/*.xml</include>
          </includes>
        </querySet>
        <querySet>
          <mainModule>src/main/xquery/query-json.xq</mainModule>
          <includes>
            <include>**/*.json</include>
          </includes>
        </querySet>
      </querySet>
    </configuration>
  </plugin>

> You can also do something like:
> 
> XdmFunctionItem parseJson = XdmFunctionItem.getSystemFunction(proc, new QName(NamespaceConstant.FN, "parse-json"), 1);
> XdmMap result = (XdmMap) fi.call(proc, new XdmAtomicValue("{\"colour\":\"green\"}"));

Thanks, that looks exactly like what I am after and is not too
low-level. :-)

Also, good to know that the Xdm* constructors are meant to be called by
client code without any factories in the mix (as is often the case when
dealing with XML-APIs).

Best wishes,

Andreas

[1]
<https://www.mojohaus.org/xml-maven-plugin/examples/transform-basic.html>

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