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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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For example, book had bookinfochapter had chapterinfoetc. It allows the content model of an element to be different when that element is in different contexts.

You can assign upink role attribute to an annotation to identify it as a certain kind of annotation. An annotation is associated with an element using attributes, not by placement, and the association can go in either or both directions. That includes the special case of the default namespace when the attribute does not define a prefix, in which case any element that is uljnk scope and without a prefix is in that namespace.

This is similar to the DocBook 4 ulink element, which was removed in DocBook 5. In DocBook 4, you docbool use xref or link with linkend attributes to form links within a DocBook document, you can use olink to form links between DocBook documents, and you can use ulink to form an arbitrary URL link.

So an alt element is always describing its parent element.

The middle column shows DocBook 4 syntax, and the right columns shows DocBook 5 syntax. For example, to open a new window when clicking a link, use the xlink: This notation is semantically equivalent to an xref. Note that the root element is now d: Internal link with literal text. Note, validation is only performed when using linkendnot with xlink: The link element is completely empty: Because these attributes are in their own namespace, they do not interfere with any native attributes declared for an element.


The annotation element’s annotates attribute accepts multiple space-separated values, so any annotation can be associated with more than one annotated element. This is similar to the DocBook 4 link and xref elements. The link and xref elements were retained in DocBook 5. Either direction is sufficient to establish the association.

An attribute such as xlink: Using both directions makes it easier to find and maintain your annotations. An annotations attribute on any element matches the value of the xml: Empty Links Using linkend This notation is semantically equivalent to an xref. If they were of type IDREF, then the elements would have to be in the same file as the associated xml: It adds the following two new elements and defines the semantics of cocbook an annotation with an element.

The way it works is you set the stylesheet parameter ulink. In DocBook 5, the alt element serves a similar function except that it is an element and it can be applied to many elements, not just images. A single info element name is used as the metadata container for all elements.

The link element has several features for creating internal or external links. Docbiok DocBook 5, only a single metadata element is needed because it uses RelaxNG as the schema language.

For example, if you put an xlink: It permits as content only text and inlinemediaobject which is only included to support characters not in the current font. The link element contains some text or even other elements: Creating a link from your DocBook document to a website is easy.

It is a general purpose element that can be used for a wide variety of annotation semantics. In DocBook 4, only specialized elements are used for creating docbooj within and between documents.


Element ulink

Universal linking in DocBook 5. For FO output, you can choose whether the url attribute value for the ulink is printed. A namespace attribute on an element means that the namespace is in scope for that element and all of its descendants.

In DocBook 4, a bookinfo comes after a book’s title element, but docblok chapterinfo element comes before a chapter’s title element. In DocBook 4, only a few elements like link and xref were used to form links.

Choosing Between Link Methods

However, in each of these other versions, certain features of the schema are lost. Use this code to create an internal link cross reference. Placing this annotation element in the chapter’s info element is simply a convenience. URL link with literal text. An XML schema defines the element and attribute names, and the rules for how they are combined into documents. A namespace attribute may optionally define a namespace prefixand then the elements in that namespace must use the prefix on the element name.

Otherwise, the element cannot be resolved docbolk processing and and the link will be broken.

Writing documentation with DocBook-XML 4.3

The former will generate a hyphen if the URL breaks, and docbooo latter will not. In DocBook 5, the info element always comes after any separate title element and before any other content. If your application requires annotations to work, then be sure your stylesheets check the integrity of the associations.

The reason for this is the different datatypes.