An attribute such as xlink:href=”” refers to an arbitrary URL. This is similar to the DocBook 4 ulink element, which was removed in DocBook 5. ULink — A link that addresses its target by means of a URL (Uniform Resource Because DocBook is harmonizing towards XML, this restriction cannot easily be. Keywords: external links, simple XLinks, xlink:href, ulink . if you want to insert a book title with an additional link, in DocBook 4 it has to be written like this.

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In DocBook 5, elements from DocBook 4 such as bookinfochapterinfosectioninfoetc.

Writing documentation with DocBook-XML 4.3

Semantically equivalent to an xref internal link. You can assign a role attribute to an annotation to identify it as a certain kind of annotation. It permits as content only text and inlinemediaobject which is only included to support characters not in the current font.

They are each described in more detail in the following sections. That standard says that any XML element can become the source or target of a link if it has the universal XLink attributes on it. An element within that scope is actually in the namespace only if the element’s ukink matches the namespace attribute’s prefix.

This is mostly unnecessary as it is overly verbose, difficult to read, and does not add any value. For example, the DocBook 5 info element in book can contain a titlebut the info element in para cannot. The text in an alt element may not appear in the output, depending on the application. Likewise, DocBook fragments can more easily be embedded in other compound document types. Another major difference between DocBook 4 and DocBook 5 is the schema language.


If you just set the parameter ulink. In most cases, ilink is enough to just use an empty link element. First consult DocBook V5. Fortunately, a guide and docbbook stylesheet exist to help transition DocBook 4 documents to DocBook5.

However, not all processors support both characters, so you should test. The link cocbook is completely empty: Because the association is by attributes, an annotation element can be located close to or far from the element it is annotating. The problem is that URLs have no spaces, and so will not be line broken on a space. It adds the following luink new elements and defines the semantics of associating an annotation with an element.

There are no predefined role values. The alt element for a short text description.

The ulink tag: Linking to a Web page

An element’s annotations attribute accepts multiple space-separated values, so any element can be associated with more than one annotation. If you also set the parameter ulink.

The annotation element’s annotates attribute accepts multiple space-separated values, so any annotation can be associated with more than one annotated element. Using both directions makes it easier to find and maintain your annotations. Otherwise, the element cannot be resolved during processing and and the link will be broken.


For example, the DTD version does not permit an element to have different content when the element appears in different contexts. In print output, long URLs that start near the end of a line may need to be broken to format nicely. Odcbook, external links are used in two ways:.

An XML schema defines the element and attribute names, and the rules for how they are combined into documents. This allows elements from other namespaces to be mixed into DocBook documents without creating element name conflicts.

Creating a link from your DocBook document to a website is easy. In DocBook 5, only a single metadata element is needed because it uses RelaxNG as the schema language. In the following example, the prefix is d:. These other versions contain the same element and attribute names.

An annotation is associated with an element using attributes, not by placement, and the association can go in either or both directions. An annotations attribute on any element matches the value of the xml: Using linkend leads always to an internal link and is dobcook equivalent to xref.