Bedienungsanleitung Kompozer 07 (Seite 52 von 58) (Englisch)

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KompoZer User Guide — 17 December 2007 Based on version 0.7.10 52

Full details of URL encoding are covered in RFC

3986 [Ref 14], Wikipedia [Ref 11] provides a simpler

explanation.

Authors often note that the names of saved files

appear with spaces replaced by %20. As explained this

is quite safe and indeed some operating systems pro-

hibit unencoded spaces in file names. It is always

preferable to avoid spaces when naming files. Use the

underscore as an alternative.

It is actually possible to use percentage encoding for

any character in the Latin 1 set.

When KompoZer percent encodes it errs on the

cautious side, that is, it may encode when this is not

strictly necessary. This occurs for two reasons.

KompoZer often cannot know the ultimate pur-

pose of the URL so cannot necessarily know

whether or not it is safe not to encode.

The specifications of what may, may not or op-

tionally may be encoded have varied from time to

time and many old systems which may not com-

ply to the latest specifications are still deployed.

Since it is permissible to percent encode any char-

acter this should not matter. Unfortunately it some-

times does. Again systems may not comply with the

current specifications.

Eric Meyer has provided a URL Decoder Encoder in

his toolbox [ref 20] which allows you to see the results

of encoding.

A6.5.2 Don't encode special chars in attribute values

The check box ‘Don't encode special characters in

attribute values’ controls whether or not KompoZer

percent encodes special characters in URLs.

As an example KompoZer encodes the pipe charac-

ter ‘|’ because an earlier specification required this.

But some systems will not decode this correctly and

malfunction. On the Nvu forum it was reported that

<img src="/cgi-

sys/Count.cgi?df=bassman7.dat|display

Counter|ft=1|md=|frgb=100;139;216|dd=E&reload=N">

was being encoded as

<img src="/cgi-

sys/Count.cgi?df=bassman7.dat%7Cdisplay=Counter%7Cft

=1%7Cmd=6%7Cfrgb=100;139;216%7Cdd =E&reload=N">

and that this was not being correctly recognised.

To solve this problem check the box ‘Don’t encode

special characters in attribute values’.

KompoZer is not capable of selectively encoding

characters in one URL and not in another. Nevertheless

this limitation does not appear to be a problem to

authors.

A6.6 References

Jukka Korpela

[1] Characters and Encodings http://www.cs.tut.fi/%7Ejkorpela/chars/covers almost every aspect of the

subject.

Alan Wood

[2] Excellent general resource http://www.alanwood.net/unicode/index.html offers several pages includ-

ing Unicode test pages, setting up of browsers, Fonts with Unicode support, Operating systems. Also

specific pages on

[3] Using special characters from Windows Glyph List 4 (WGL4) in HTML

http://www.alanwood.net/demos/wgl4.html

[4] Unicode fonts for Windows computers http://www.alanwood.net/unicode/fonts.html

[5] Unicode character ranges and the Unicode fonts that support them.

http://www.alanwood.net/unicode/fontsbyrange.html

[6] Greek, Mathematical and Punctuation http://www.alanwood.net/demos/symbol.html

[7] Microsoft Wingdings font http://www.alanwood.net/demos/wingdings.html

Wikipedia has good articles on

[8] ASCII http://en.wikipedia.org/wiki/ASCII

[9] ISO 8859-1 http://en.wikipedia.org/wiki/ISO/IEC_8859-1 also other parts

[10] Mapping of Unicode characters to Unicode planes

http://en.wikipedia.org/wiki/Mapping_of_Unicode_characters

[11] URL encoding http://en.wikipedia.org/wiki/Percent-encoding

Microsoft has

[12] Extension for the properties tab of Windows Explorer to check Unicode support.

http://www.microsoft.com/typography/property/property.htm

13] Windows 1252 http://www.microsoft.com/globaldev/reference/sbcs/1252.mspx character listing

Standards and Specifications

[14] RFC 3986 Uniform Resource Identifier Generic Syntax http://www.ietf.org/rfc/rfc3986.txt

[15] CSS 2.1 specification http://www.w3.org/TR/CSS21/

[16] HTML 4.01 specification http://www.w3.org/TR/html4/cover.html

[17] Unicode site http://www.unicode.org

Other resources

[18] Penn State University http://tlt.its.psu.edu/suggestions/international/web/unicode.html also has an

excellent page on 'Getting Started: Unicode' which covers OS, Browsers, fonts etc

[19] W3C http://www.w3.org/International/tutorials/tutorial-char-enc/en/all.html offer a somewhat

more technical tutorial dealing mainly with encoding and covering material that KompoZer hides from

the author

[20] Eric Meyer http://meyerweb.com/eric/tools/ has a toolbox which includes a URL Decoder Encoder.

[21] AllChars http://allchars.zwolnet.com/ has a freeware utility that allows you to enter any Windows

1282 character using a few keystrokes

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