JarCastingnode-elementtree
node-elementtree is a Node.js XML parser and serializer based upon the Python ElementTree v1.3 module.
Installation
$ npm install 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});
console.log(xml);
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">
<TenantId>12345</TenantId>
<ServiceName>MaaS</ServiceName>
<ResourceID>enAAAA</ResourceID>
<UsageID>550e8400-e29b-41d4-a716-446655440000</UsageID>
<EventType>create</EventType>
<category term="monitoring.entity.create"/>
<DataCenter>global</DataCenter>
<Region>global</Region>
<StartTime>Sun Apr 29 2012 16:37:32 GMT-0700 (PDT)</StartTime>
<ResourceName>entity</ResourceName>
</entry>
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
License
node-elementtree is distributed under the Apache license.
