[Python-Dev] XML codec? (original) (raw)

M.-A. Lemburg mal at egenix.com
Sun Nov 11 18:36:49 CET 2007

On 2007-11-11 14:51, Martin v. Löwis wrote:

A non-seekable stream is not all that uncommon in network processing. Right. But what is the relationship to XML encoding autodetection? It pops up whenever you need to detect the encoding of the incoming XML data on the network connection, e.g. in XML RPC or data upload mechanisms. No, it doesn't. For XML-RPC, you pass the XML payload of the HTTP request to the XML parser, and it deals with the encoding.

First, XML-RPC is not the only mechanism using XML over a network connection. Second, you don't want to do this if you're dealing with several 100 MB of data just because you want to figure out the encoding.

It is also not always feasible to load all data into memory, so some form of buffering must be used. Again, I don't see the use case. For XML-RPC, it's very feasible and standard procedure to have the entire document in memory (in a processed form).

You may not see the use case, but that doesn't really mean anything if the use cases exist in real life applications, right ?!

This approach is also needed if you want to stack stream codecs (not sure whether this is still possible in Py3, but that's how I designed them for Py2). The design of the Py2 codecs is fairly flawed, unfortunately.

Fortunately, this sounds like a fairly flawed argument to me ;-)

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