Related Topics: Industrial IoT, Microservices Expo

Industrial IoT: Article

Index XML Documents with VTD-XML

How to turn the indexing capability on in your application

Applications Scenarios
There are at least two different views to make sense of VTD+XML as a practical solution to real problems. The first is a traditional view of native XML indexing. Alternatively, you can think of VTD+XML as a binary data format backwards-compatible with XML.

Native XML Indexing
In this view, you simply use VTD+XML as the basis for native XML data stores that serve the backend data needs of XML/SOA applications. By saving it as a BLOB (Binary Large OBject) in a more traditional database table, you obtain the additional capabilities such as concurrency and data integrity and replication. Being vastly superior to the awkward shredding-based XML to relational data mapping, VTD+XML fits exceptionally well in a pure XML/SOA environment. Have a lot of XBRL (Extensible Business Reporting Language) documents, or those big GML (Geography Markup Language) files? VTD+XML should equip you with horsepower never before available.

Binary Enhanced XML
VTD+XML also naturally extends the core capabilities of XML by boosting its processing efficiency to a whole new level. In other words, as a wire format, XML now has it all: not only is it easy to learn, human-readable, interoperable, and loosely encoded by design, performance-wise it also leads CORBA, DCOM, and RMI by a mile. When applied to XML pipelining, VTD+XML can potentially eliminate the repetitive parsing at each stage of the pipeline - an issue none of the existing XML pipeline specs (e.g., XProc and the XML pipeline definition language) address.

If it takes too long for you to push large documents over your DOM-based ESB (Enterprise Services Bus), how does 100MB around a single second sound?

This section shows you quantitatively the performance gain achievable using VTD+XML. The benchmark code measures the combined latency of VTD+XML index-loading (as in VTD-XML 2.0) and XPath evaluation of a specified number of nodes (the first five nodes in the set) in the result nodeset. The same code is also rewritten using the Xerces DOM parser and Xalan or Jaxen, both of which are popular XPath engines. The benchmark code used for the test can be downloaded here.

The environment for the benchmark has the following setup:

  • Hardware: A Sony VAIO notebook featuring a 1.7GHz Pentium M processor with 2MB of integrated cache memory, 512MB of DDR2 RAM, and a 400MHz front-side bus.
  • OS/JVM setting: The notebook runs Windows XP, and the test applications are obtained from version of JDK/JVM.
  • XML parsers and XPath engines: The DOM code uses both Xalan (bundled in the JDK) and Jaxen over Xerces DOM (full node expansion). VTD-XML, on the other hand, uses the built-in XPath engine.
To reduce timing variations due to I/O, the benchmark programs first read XML files into the memory buffer prior to the test runs and output XML files into an in-memory byte array output stream. The server JVM is used to get peak performance. All input/output streams are reused whenever possible.

Three XML files of similar structure, but different sizes, are used for the test.

<?xml version="1.0"?>
<purchaseOrder orderDate="1999-10-20">
   <shipTo country="US">
     <name>Alice Smith</name>
     <street>123 Maple Street</street>
     <city>Mill Valley</city>
   <billTo country="US">
     <name> Robert Smith </name>
     <street>8 Oak Avenue</street>
     <city>Old Town</city>
   <comment>Hurry, my lawn is going wild!</comment>
     <item partNum="872-AA">
       <comment>Confirm this is electric</comment>
     <item partNum="926-AA">
       <productName>Baby Monitor</productName>

The respective file sizes are:

  • "po_small.xml" ---- 6780 bytes
  • "po_medium.xml" ---- 112,238 bytes
  • "po_big.xml" ----- 1,219,388 bytes

    The following XPath expressions are used for the test

  • /*/*/*[position() mod 2 = 0]
  • /purchaseOrder/items/item[USPrice<100]
  • /*/*/*/quantity/text()
  • //item/comment
  • //item/comment/../quantity

More Stories By Jimmy Zhang

Jimmy Zhang is a cofounder of XimpleWare, a provider of high performance XML processing solutions. He has working experience in the fields of electronic design automation and Voice over IP for a number of Silicon Valley high-tech companies. He holds both a BS and MS from the department of EECS from U.C. Berkeley.

Comments (0)

Share your thoughts on this story.

Add your comment
You must be signed in to add a comment. Sign-in | Register

In accordance with our Comment Policy, we encourage comments that are on topic, relevant and to-the-point. We will remove comments that include profanity, personal attacks, racial slurs, threats of violence, or other inappropriate material that violates our Terms and Conditions, and will block users who make repeated violations. We ask all readers to expect diversity of opinion and to treat one another with dignity and respect.

Latest Stories
@DevOpsSummit at Cloud Expo, taking place November 12-13 in New York City, NY, is co-located with 22nd international CloudEXPO | first international DXWorldEXPO and will feature technical sessions from a rock star conference faculty and the leading industry players in the world. The widespread success of cloud computing is driving the DevOps revolution in enterprise IT. Now as never before, development teams must communicate and collaborate in a dynamic, 24/7/365 environment. There is no time t...
The Internet of Things will challenge the status quo of how IT and development organizations operate. Or will it? Certainly the fog layer of IoT requires special insights about data ontology, security and transactional integrity. But the developmental challenges are the same: People, Process and Platform and how we integrate our thinking to solve complicated problems. In his session at 19th Cloud Expo, Craig Sproule, CEO of Metavine, demonstrated how to move beyond today's coding paradigm and sh...
DevOps with IBMz? You heard right. Maybe you're wondering what a developer can do to speed up the entire development cycle--coding, testing, source code management, and deployment-? In this session you will learn about how to integrate z application assets into a DevOps pipeline using familiar tools like Jenkins and UrbanCode Deploy, plus z/OSMF workflows, all of which can increase deployment speeds while simultaneously improving reliability. You will also learn how to provision mainframe syste...
CloudEXPO New York 2018, colocated with DXWorldEXPO New York 2018 will be held November 11-13, 2018, in New York City and will bring together Cloud Computing, FinTech and Blockchain, Digital Transformation, Big Data, Internet of Things, DevOps, AI, Machine Learning and WebRTC to one location.
The best way to leverage your Cloud Expo presence as a sponsor and exhibitor is to plan your news announcements around our events. The press covering Cloud Expo and @ThingsExpo will have access to these releases and will amplify your news announcements. More than two dozen Cloud companies either set deals at our shows or have announced their mergers and acquisitions at Cloud Expo. Product announcements during our show provide your company with the most reach through our targeted audiences.
Cell networks have the advantage of long-range communications, reaching an estimated 90% of the world. But cell networks such as 2G, 3G and LTE consume lots of power and were designed for connecting people. They are not optimized for low- or battery-powered devices or for IoT applications with infrequently transmitted data. Cell IoT modules that support narrow-band IoT and 4G cell networks will enable cell connectivity, device management, and app enablement for low-power wide-area network IoT. B...
Traditional on-premises data centers have long been the domain of modern data platforms like Apache Hadoop, meaning companies who build their business on public cloud were challenged to run Big Data processing and analytics at scale. But recent advancements in Hadoop performance, security, and most importantly cloud-native integrations, are giving organizations the ability to truly gain value from all their data. In his session at 19th Cloud Expo, David Tishgart, Director of Product Marketing ...
DevOpsSummit New York 2018, colocated with CloudEXPO | DXWorldEXPO New York 2018 will be held November 11-13, 2018, in New York City. Digital Transformation (DX) is a major focus with the introduction of DXWorldEXPO within the program. Successful transformation requires a laser focus on being data-driven and on using all the tools available that enable transformation if they plan to survive over the long term.
What are the new priorities for the connected business? First: businesses need to think differently about the types of connections they will need to make – these span well beyond the traditional app to app into more modern forms of integration including SaaS integrations, mobile integrations, APIs, device integration and Big Data integration. It’s important these are unified together vs. doing them all piecemeal. Second, these types of connections need to be simple to design, adapt and configure...
Jo Peterson is VP of Cloud Services for Clarify360, a boutique sourcing and benchmarking consultancy focused on transforming technology into business advantage. Clarify360 provides custom, end-to-end solutions from a portfolio of more than 170 suppliers globally. As an engineer, Jo sources net new technology footprints, and is an expert at optimizing and benchmarking existing environments focusing on Cloud Enablement and Optimization. She and her team work with clients on Cloud Discovery, Cloud ...
The standardization of container runtimes and images has sparked the creation of an almost overwhelming number of new open source projects that build on and otherwise work with these specifications. Of course, there's Kubernetes, which orchestrates and manages collections of containers. It was one of the first and best-known examples of projects that make containers truly useful for production use. However, more recently, the container ecosystem has truly exploded. A service mesh like Istio addr...
Adding public cloud resources to an existing application can be a daunting process. The tools that you currently use to manage the software and hardware outside the cloud aren’t always the best tools to efficiently grow into the cloud. All of the major configuration management tools have cloud orchestration plugins that can be leveraged, but there are also cloud-native tools that can dramatically improve the efficiency of managing your application lifecycle. In his session at 18th Cloud Expo, ...
Transformation Abstract Encryption and privacy in the cloud is a daunting yet essential task for both security practitioners and application developers, especially as applications continue moving to the cloud at an exponential rate. What are some best practices and processes for enterprises to follow that balance both security and ease of use requirements? What technologies are available to empower enterprises with code, data and key protection from cloud providers, system administrators, inside...
With the proliferation of both SQL and NoSQL databases, organizations can now target specific fit-for-purpose database tools for their different application needs regarding scalability, ease of use, ACID support, etc. Platform as a Service offerings make this even easier now, enabling developers to roll out their own database infrastructure in minutes with minimal management overhead. However, this same amount of flexibility also comes with the challenges of picking the right tool, on the right ...
Nicolas Fierro is CEO of MIMIR Blockchain Solutions. He is a programmer, technologist, and operations dev who has worked with Ethereum and blockchain since 2014. His knowledge in blockchain dates to when he performed dev ops services to the Ethereum Foundation as one the privileged few developers to work with the original core team in Switzerland.