1. Invisible XML in Saxon
The CoffeeSacks extension functions allow a stylesheet to load an Invisible XML grammar and process an input against it. Grammar processing can be expensive. To mitigate this cost, by default CoffeeSacks keeps a cache of parsed grammar.
The class org.nineml.coffeesacks.RegisterCoffeeSacks
is suitable for registering the extension functions to a Saxon HE processor.
All of the functions are in the namespace
http://nineml.com/ns/coffeesacks
which is taken to be bound to
the cs:
namespace prefix in this document.
Given an Invisible XML grammar for dates in dates.ixml
:
1date: s?, day, -s, month, (-s, year)? .
-s: -" "+ .
day: digit, digit? .
-digit: "0"; "1"; "2"; "3"; "4"; "5"; "6"; "7"; "8"; "9".
5month: "January"; "February"; "March"; "April";
"May"; "June"; "July"; "August";
"September"; "October"; "November"; "December".
year: (digit, digit)?, digit, digit .
A stylesheet like the following will parse a string against that grammar and return the result:
1<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:cs="http://nineml.com/ns/coffeesacks"
exclude-result-prefixes="#all"
version="3.0">
5
<xsl:template name="xsl:initial-template">
<xsl:variable name="grammar" select="cs:grammar('date.ixml')"/>
<doc>
<xsl:sequence select="cs:parse-string($grammar, '15 February 2022')"/>
10</doc>
</xsl:template>
</xsl:stylesheet>
Returning:
1<doc>
<date>
<day>15</day>
<month>February</month>
5<year>2022</year>
</date>
</doc>