Create a new snippet from a blank template.

CustomXML.WORD.yaml

name: CustomXML
description: Create a new snippet from a blank template.
host: WORD
api_set: {}
script:
  content: |
    $("#add-xml").click(() => tryCatch(run));
    $("#get-node").click(() => tryCatch(getNode));
    $("#delete-xml").click(() => tryCatch(deleteXml));

    async function run() {
      const xml = `<AP xmlns="accordproject.org"><template xmlns="acceptance-of-delivery"><shipper>Aman Sharma</shipper></template></AP>`;
      await Word.run(async context => {
        const customXmlParts = context.document.customXmlParts;
        customXmlParts.add(xml);
      })
    }

    async function getNode() {
      await Word.run(async context => {
        const customXmlParts = context.document.customXmlParts;
        const AP = customXmlParts.getByNamespace("accordproject.org").getOnlyItemOrNullObject();
        await context.sync();
        const nodes = AP.query('/AP/template', {}); // how does this work?
        await context.sync();
        console.log(nodes);
      })
    }

    async function deleteXml() {
      Office.context.document.customXmlParts.getByNamespaceAsync("accordproject.org", (res) => {
        if (res.status === Office.AsyncResultStatus.Succeeded) {
          for (let item of res.value) {
            item.deleteAsync();
          }
        }
      });
    }

    /** Default helper for invoking an action and handling errors. */
    async function tryCatch(callback) {
      try {
        await callback();
      } catch (error) {
        // Note: In a production add-in, you'd want to notify the user through your add-in's UI.
        console.error(error);
      }
    }
  language: typescript
template:
  content: |-
    <button id="add-xml" class="ms-Button">
        <span class="ms-Button-label">Add XML</span>
    </button>
    <button id="get-node" class="ms-Button">
        <span class="ms-Button-label">Get XML Node</span>
    </button>
    <button id="delete-xml" class="ms-Button">
        <span class="ms-Button-label">Delete XML</span>
    </button>
  language: html
style:
  content: |-
    section.samples {
        margin-top: 20px;
    }

    section.samples .ms-Button, section.setup .ms-Button {
        display: block;
        margin-bottom: 5px;
        margin-left: 20px;
        min-width: 80px;
    }
  language: css
libraries: |
  https://appsforoffice.microsoft.com/lib/beta/hosted/office.js
  @types/office-js-preview

  office-ui-fabric-js@1.4.0/dist/css/fabric.min.css
  office-ui-fabric-js@1.4.0/dist/css/fabric.components.min.css

  core-js@2.4.1/client/core.min.js
  @types/core-js

  jquery@3.1.1
  @types/jquery@3.3.1