<property
  name = NMTOKEN
  url = boolean
  xml:space = preserve
>text</property>

Specifies system property called name, having text as its value.

If the url attribute is specified and its value is true, text must be a relative or absolute URL (properly escaped like all URLs). In such case, the value of system property is the fully resolved URL.

Examples:

<property name="color">red</property>

<property name="icon.3" url="true">resources/icon.gif</property>