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--- user:zeman:interset:how-to-write-a-driver [2007/10/01 13:51]
zeman Link fix.
+++ user:zeman:interset:how-to-write-a-driver [2007/10/01 13:53]
zeman use tagset::common;
@@ Line 1: / Line 1: @@
 ====== How to write a driver ======
-Perl is the language to write a driver. A driver is a simple Perl module (.pm). It should implement the following functions: decode(), encode(), list().
+Perl is the language to write a driver. A driver is a simple Perl module (.pm). It should implement the following functions: ''decode()'', ''encode()'', ''list()''. The ''tagset/common.pm'' module contains some code you may have use for, so your driver module should start with
-Input/output tag can be any string. If the information is stored in several kinds of tags, they can be passed in one string, using some unique delimiters. We recommend "\t" (horizontal tab, ASCII 9) as delimiter. If desirable, the input/output tag can be even a multi-line XML!
+<code perl>use tagset::common;</code>
+The input/output tag can be any string. If the information is stored in several kinds of tags, they can be passed in one string, using some unique delimiters. We recommend "\t" (horizontal tab, ASCII 9) as delimiter. If desirable, the input/output tag can be even a multi-line XML!
 Empty feature value means "unknown". It is even not known, whether this feature would be relevant. If we know that a feature is irrelevant, we can set it to "n/a" (not applicable; although not mentioned explicitly, this value is allowed for all features). However, I am not sure whether this should be used at all. While something can be irrelevant in one tagset, we can hardly say that it is not relevant in any tagset. So, since we are setting a value in a universal "tagset", we probably better leave the value empty or even set it to an appropriate default.

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