[EM] Why is XML perfect?
Narins, Josh
josh.narins at lehman.com
Mon Sep 30 07:48:11 PDT 2002
Oh, why?
Sharing data.
I don't care if you write assembler(ha!) or visual basic(haha!), or if you
count Condorcet or approval, this representation of the data will be
acceptable input to anything.
FYI, the most standards compliant fast way to parse XML data is called SAX.
SAX2 adds support for namespaces (which we should use, but can generally be
ignored) and other features.
I write SAX parsers all the time.
For fun.
-----Original Message-----
From: Narins, Josh
Sent: Monday, September 30, 2002 9:33 AM
To: 'election-methods-list at eskimo.com'
Subject: [EM] Why is XML perfect?
XML can represent all data.
XML is still on version 1.0 (name another widely used computer specification
that is!)
Humans and computer can read much XML.
All major computer languages have XML support, even XMLNS (XML with
NameSpaces)
Here is a _well-formed_ (1) and _0valid (2) XML document for voting.
I wrote F{64} to represent a 64 character hex string. FF represents a two
character hex string.
Comments?
-Josh Narins
(1) That's easy. There are only 5 or 6 rules. You can't have a & or a <, you
have to write them & and <. You also have limited use of " ' and >
(" ' and >) I leave the rest as an exercise for the reader.
(2) all the DOCTYPE stuff in the second example sets out a set of rules for
the data
<?xml version="1.0"?>
<v:vote id="F{64}" xmlns:v="http://x.narins.net/mlns/vote.dtd">
<time value="2002091120:10:05" />
<location value="F{64}" />
<crew supervisor="F{128}" machine="F{128}:F{128}:F{128}" sub="F{128}" />
<race id="FF">
<candidate id="FF" rank="FF" />
<candidate id="FF" rank="FF" />
<candidate id="FF" rank="FF" />
<candidate id="FF" rank="FF" />
</race>
<issue id="FF">
<option id="FF" rank="FF" />
<option id="FF" rank="FF" />
<option id="FF" rank="FF" />
<option id="FF" rank="FF" />
</issue>
</v:vote>
THIS VERSION INCLUDES ITS OWN DTD, that makes it more correct.
<?xml version="1.0" standalone="yes"?>
<!DOCTYPE vote [
<!ELEMENT vote (time,location,crew,(race|issue)*)>
<!ATTLIST vote xmlns:v CDATA #FIXED
"http://x.narins.net/mnlns/vote.dtd">
<!ELEMENT time EMPTY>
<!ATTLIST time value NMTOKEN #REQUIRED>
<!ELEMENT location EMPTY>
<!ATTLIST location value NMTOKEN #REQUIRED>
<!ELEMENT crew EMPTY>
<!ATTLIST crew supervisor NMTOKEN #REQUIRED
machine NMTOKEN #REQUIRED
sub NMTOKEN #IMPLIED>
<!ELEMENT race (candidate+)>
<!ATTLIST race id NMTOKEN #REQUIRED>
<!ELEMENT candidate EMPTY>
<!ATTLIST candidate id NMTOKEN #REQUIRED
rank NMTOKEN #IMPLIED>
<!ELEMENT issue (option+)>
<!ATTLIST issue id NMTOKEN #REQUIRED>\
<!ELEMENT option EMPTY>
<!ATTLIST option id NMTOKEN #REQUIRED
rank NMTOKEN #IMPLIED>
]>
<v:vote xmlns:v="http://x.narins.net/mlns/vote.dtd">
<time value="2002091120:10:05" />
<location value="F{64}" />
<crew supervisor="F{128}"
machine="F{128}:F{128}:F{128}"
sub="F{128}" />
<race id="FF">
<candidate id="FF" rank="FF" />
<candidate id="FF" rank="FF" />
<candidate id="FF" rank="FF" />
<candidate id="FF" rank="FF" />
</race>
<issue id="FF">
<option id="FF" rank="FF" />
<option id="FF" rank="FF" />
<option id="FF" rank="FF" />
<option id="FF" rank="FF" />
</issue>
</v:vote>
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information is subject to change without notice.
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