2.0 : fastest read-only forward-only loading method

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John A Grandy - 28 Mar 2006 22:22 GMT

In 2.0 what is the fastest way to iterate through an element set in a
read-only forward-only XMLDocument ?

For example , load the key/value pairs in the following xml doc into a
hashtable :

<Mappings>
<Mapping MappingKey="AL" MappingValue="Alabama" />
<Mapping MappingKey="CA" MappingValue="Alabama" />
</Mappings>

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Martin Honnen - 29 Mar 2006 12:35 GMT

> In 2.0 what is the fastest way to iterate through an element set in a
> read-only forward-only XMLDocument ?

Create an XmlReader and read out the nodes you are looking for. That
assumes you have an XML document in a file or stream. If you already
have a DOM XmlDocument instance then using XPath is an option.

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Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

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John A Grandy - 19 Apr 2006 21:39 GMT

Unless your xml schema is simplistic, I think an XPathReader is typically
necessary ... no ?

>> In 2.0 what is the fastest way to iterate through an element set in a
>> read-only forward-only XMLDocument ?
>
> Create an XmlReader and read out the nodes you are looking for. That
> assumes you have an XML document in a file or stream. If you already have
> a DOM XmlDocument instance then using XPath is an option.

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Martin Honnen - 20 Apr 2006 13:26 GMT

> Unless your xml schema is simplistic, I think an XPathReader is typically
> necessary ... no ?

You asked the following:

>>>In 2.0 what is the fastest way to iterate through an element set in a
>>>read-only forward-only XMLDocument ?

For read-only forward-only fastest reading an XmlReader is the tool.

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Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

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John A Grandy - 21 Apr 2006 17:35 GMT

Right, but what if the element set you wish to iterate through is buried in
a complex XML hierarchy ...

>> Unless your xml schema is simplistic, I think an XPathReader is typically
>> necessary ... no ?
[quoted text clipped - 5 lines]
>
> For read-only forward-only fastest reading an XmlReader is the tool.

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Martin Honnen - 21 Apr 2006 17:46 GMT

> Right, but what if the element set you wish to iterate through is buried in
> a complex XML hierarchy ...

Well Xml(Text)Reader pulls in node by node so it is capable with dealing
with a complex XML hierarchy, you simply need to make sure your code
using the reader finds what it is looking for.
I don't think we will get far by discussing further without knowing the
XML markup you have in mind so feel free to post a URL for instance. Of
course you can use XPath if you want to, it is not that my suggestion
was meant to rule XPath out.

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Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

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2.0 : fastest read-only forward-only loading method

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