Hi Lucas,
I'm not sure whether this could rightly be said to map to the "decorator"
pattern (maybe so), but it seems to me you may be looking for the idiom:
<xsl:template match="something">
<xsl:call-template name="some-wrapper"/>
</xsl:template>
<xsl:template name="some-wrapper">
<xsl:param name="contents">
<xsl:apply-templates/>
</xsl:param>
<wrapper>
<xsl:copy-of select="$contents"/>
</wrapper>
</xsl:template>
this allows you also to do things like
<xsl:template match="something-else">
<xsl:call-template name="some-wrapper">
<xsl:with-param select="contents">
<xsl:call-template name="some-other-wrapper"/>
</xsl:with-param>
</xsl:call-template>
</xsl:template>
or even
<xsl:template match="another-something-else">
<xsl:call-template name="some-wrapper">
<xsl:with-param select="contents">
<xsl:text>Wrap me!</xsl:text>
</xsl:with-param>
</xsl:call-template>
<xsl:apply-templates/>
</xsl:template>
That is, the "wrapper" (or decorator) template can wrap anything you pass it.
A "thick" solution to a nasty problem (map a set of attributes to a set of
wrappers) using this idiom (although by matching templates, not calling
them by name) appears at
But I should also caution you that it isn't very common to have to do this;
lighter-weight solutions are usually possible. Also, as Jay says, the
requirements this addresses are often better answered by pushing the
problem into the next layer up, for example into a CSS stylesheet to be
applied to HTML output.
Enjoy!
Wendell
At 08:37 AM 3/18/2005, you wrote:
Hi,
I'm using XSL version 1.0 and am trying to use the decorator design
pattern, but can't get it to work in XSL.
Here is what I try to achieve:
Different types of elements all need to be surrounded by the same text.
For example:
I've XML:
<base>
<section>
<title>the title</title>
<paragraph>some text</paragraph>
<paragraph>more text</paragraph>
</section>
<section>
<title>the title</title>
<paragraph>other text</paragraph>
<paragraph>more other text</paragraph>
<paragraph>and more text</paragraph>
</section>
</base>
Now I want all text in titles and in paragraphs to be italic and in
titles also to be bold.
My first thought was to use call-template like this:
<xsl:template match="title">
<xsl:call-template name="bold">
<xsl:call-template name="italic">
<xsl:value-of select="."/>
</xsl:call-template>
</xsl:call-template>
</xsl:template>
But this is not the way to do this.
I cannot however figure out or find the solution. The decoration that
must be applied is much more complicated than bold or italic, but that
is besides the point, I think.
Here is my second try, but here is the problem that I cannot nest
decorators, so bold and italic is not possible on the same element:
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
version="1.0">
<xsl:template match="/">
<xsl:call-template name="body"/>
</xsl:template>
<xsl:template match="section">
<xsl:apply-templates />
<br/>
</xsl:template>
<xsl:template match="title">
<xsl:call-template name="bold" />
<br/>
</xsl:template>
<xsl:template match="paragraph">
<xsl:call-template name="italic" />
</xsl:template>
<xsl:template name="bold">
<b>
<xsl:apply-templates/>
</b>
</xsl:template>
<xsl:template name="italic">
<i>
<xsl:apply-templates/>
</i>
</xsl:template>
<xsl:template name="body">
<html>
<body>
<xsl:apply-templates />
</body>
</html>
</xsl:template>
</xsl:stylesheet>
Can anybody give me a pointer?
Thanks in advance
Lucas
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