如何在 Flutter 中解析 xml 时使用 getElement

Question

我面临无法使用 Dart 中 xml 包中的 getElement 函数的问题。我正在正确解析 xml 文档，我可以显示整个文档的字符串，但是当我使用 getElement 函数时 returns null.

这是xml文档

<?xml version="1.0" encoding="UTF-8"?>
<qti-assessment-item
xmlns="http://www.imsglobal.org/xsd/qti/imsqtiasi_v3p0" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.imsglobal.org/xsd/imsqtiasi_v3p0 
https://purl.imsglobal.org/spec/qti/v3p0/schema/xsd/imsqti_asiv3p0_v1p0.xsd"
identifier="firstexample"
time-dependent="false" 
xml:lang="en-US">

  <qti-response-declaration base-type="identifier" cardinality="single" identifier="RESPONSE">
    <qti-correct-response>
      <qti-value>A</qti-value>
    </qti-correct-response>
  </qti-response-declaration>

  <qti-outcome-declaration base-type="float" cardinality="single" identifier="SCORE">
    <qti-default-value>
      <qti-value>A</qti-value>
    </qti-default-value>
  </qti-outcome-declaration>

  <qti-item-body>

  <p>Of the following hormones, which is produced by the adrenal glands?</p>
    <qti-choice-interaction max-choices="1" min-choices="1" 
    response-identifier="RESPONSE">
      <qti-simple-choice identifier="A">Epinephrine</qti-simple-choice>
      <qti-simple-choice identifier="B">Glucagon</qti-simple-choice>
      <qti-simple-choice identifier="C">Insulin</qti-simple-choice>
      <qti-simple-choice identifier="D">Oxytocin</qti-simple-choice>
    </qti-choice-interaction>

  </qti-item-body>

  <qti-response-processing
  template="https://purl.imsglobal.org/spec/qti/v3p0/rptemplates/match_correct"/>

</qti-assessment-item>

用于加载 xml 文档的函数

Future<String> loadString(BuildContext context, String path) async {
    return await DefaultAssetBundle.of(context).loadString(path);
  }

尝试获取文档的一个元素

 XmlDocument? xmlDocument;
    loadString(context, "assets/qti3/items/choice-single-cardinality.xml").then(
      (value) {
        xmlDocument = XmlDocument.from(value);
        XmlElement? response =
            xmlDocument!.getElement("qti-response-declaration");
      },
    );

我尝试了其他 xml 文档和 xml 没有连字符的标签，但到目前为止没有任何效果..

Answer 1

getElement only returns a direct child element, use findAllElements to find elements deep inside the tree. See the tutorial on traversing and querying 以获得对这些访问器和许多其他访问器的描述。

如何在 Flutter 中解析 xml 时使用 getElement

How to use getElement while parsing xml in Flutter

xml

dart

flutter