What is the process of incorporating CSS into XML files?

My goal is to implement an embedded bar-code font via CSS in an XML file. The XML file provides order numbers that I want to visually represent as a barcode.

Once this document is sent via email, it automatically generates a sales invoice.

This snippet generates the order numbers:

   <font face="barcode">
                <xsl:value-of select="$OrderInfo/OrderNumber" />

              </font>

I have attempted to link my CSS using these methods:

<?xml-stylesheet type="text/css" href="App_Themes/Skin_3/style.css" ?>

<link href="App_Themes/Skin_3/style.css" type="text/css" rel="stylesheet"/>

Here is the CSS code for the embedded font:

@font-face {
    font-family: barcode;
    src: url(Fonts/IDAutomationHC39M_FREE.otf)  format("truetype");
}

barcode
{
    font-family: barcode; 
    font-size: 26px;
    font-weight: normal;
}

Answer №1

HTML provides a link element for external style sheets, but not all XML-based formats include this feature. In cases where there is no suitable element, you can still attach external style sheets using the xml-stylesheet processing instruction as shown below:

<?xml-stylesheet href="my-style.css"?>

It is important to note that this processing instruction (PI) should be placed before the first tag of the document. While the type="text/css" attribute is optional, including it can help the browser determine whether to download the CSS file if it does not support CSS.

Similar to the link element in HTML, multiple xml-stylesheet PIs can be used with attributes to specify the type, medium, and title.

For example:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?> 
<?xml-stylesheet type="text/css" href="style.css"?>

For more information, you can visit the reference page.

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