0.1.6 • Public • Published


    node-elementtree is a Node.js XML parser and serializer based upon the Python ElementTree v1.3 module.


    $ npm install @azz/elementtree

    Using the library

    For the usage refer to the Python ElementTree library documentation - http://effbot.org/zone/element-index.htm#usage.

    Supported XPath expressions in find, findall and findtext methods are listed on http://effbot.org/zone/element-xpath.htm.

    Example 1 – Creating An XML Document

    This example shows how to build a valid XML document that can be published to Atom Hopper. Atom Hopper is used internally as a bridge from products all the way to collecting revenue, called “Usage.” MaaS and other products send similar events to it every time user performs an action on a resource (e.g. creates,updates or deletes). Below is an example of leveraging the API to create a new XML document.

    var et = require('elementtree');
    var XML = et.XML;
    var ElementTree = et.ElementTree;
    var element = et.Element;
    var subElement = et.SubElement;
    var date, root, tenantId, serviceName, eventType, usageId, dataCenter, region,
    checks, resourceId, category, startTime, resourceName, etree, xml;
    date = new Date();
    root = element('entry');
    root.set('xmlns', 'http://www.w3.org/2005/Atom');
    tenantId = subElement(root, 'TenantId');
    tenantId.text = '12345';
    serviceName = subElement(root, 'ServiceName');
    serviceName.text = 'MaaS';
    resourceId = subElement(root, 'ResourceID');
    resourceId.text = 'enAAAA';
    usageId = subElement(root, 'UsageID');
    usageId.text = '550e8400-e29b-41d4-a716-446655440000';
    eventType = subElement(root, 'EventType');
    eventType.text = 'create';
    category = subElement(root, 'category');
    category.set('term', 'monitoring.entity.create');
    dataCenter = subElement(root, 'DataCenter');
    dataCenter.text = 'global';
    region = subElement(root, 'Region');
    region.text = 'global';
    startTime = subElement(root, 'StartTime');
    startTime.text = date;
    resourceName = subElement(root, 'ResourceName');
    resourceName.text = 'entity';
    etree = new ElementTree(root);
    xml = etree.write({'xml_declaration': false});

    As you can see, both et.Element and et.SubElement are factory methods which return a new instance of Element and SubElement class, respectively. When you create a new element (tag) you can use set method to set an attribute. To set the tag value, assign a value to the .text attribute.

    This example would output a document that looks like this:

    <entry xmlns="http://www.w3.org/2005/Atom">
      <category term="monitoring.entity.create"/>
      <StartTime>Sun Apr 29 2012 16:37:32 GMT-0700 (PDT)</StartTime>

    Example 2 – Parsing An XML Document

    This example shows how to parse an XML document and use simple XPath selectors. For demonstration purposes, we will use the XML document located at https://gist.github.com/2554343.

    Behind the scenes, node-elementtree uses Isaac’s sax library for parsing XML, but the library has a concept of “parsers,” which means it’s pretty simple to add support for a different parser.

    var fs = require('fs');
    var et = require('elementtree');
    var XML = et.XML;
    var ElementTree = et.ElementTree;
    var element = et.Element;
    var subElement = et.SubElement;
    var data, etree;
    data = fs.readFileSync('document.xml').toString();
    etree = et.parse(data);
    console.log(etree.findall('./entry/TenantId').length); // 2
    console.log(etree.findtext('./entry/ServiceName')); // MaaS
    console.log(etree.findall('./entry/category')[0].get('term')); // monitoring.entity.create
    console.log(etree.findall('*/category/[@term="monitoring.entity.update"]').length); // 1

    Build status

    Build Status


    node-elementtree is distributed under the Apache license.


    npm i @azz/elementtree

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