XSLT 2.0 and XPath 2.0 Programmer's Reference, 4th Edition (51 page)

For example, suppose you have a set of images representing an alphabet such as the following, and you want to use these to represent the first character of a paragraph of text.

You could write a template rule to achieve this as follows (ignoring practical details such as how to deal with paragraphs that don't start with a capital letter). It uses the
substring()
function, which is described in Chapter 13.

A paragraph that starts with the letter A (like this one) will cause the
src
attribute of the

element to be evaluated as
img src = “fancyA.gif”
, so it will be displayed in the browser as shown in
Figure 3-5
.

Figure 3-5

If you want to include the characters
{
or
}
in an attribute value with their ordinary meaning, they should be doubled as
{{
or
}}
. This is sometimes necessary when generating dynamic HTML, and it also happens often with the
regex
attribute of the

instruction, whose value is a regular expression. However, you should do this only in an attribute that is being interpreted as an attribute value template. In other attributes, curly braces have no special meaning.