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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So an alt element is always describing its parent element.

DocBook 5 is the next generation of DocBook. Generally you should set ulink. This allows elements from other namespaces to be mixed into DocBook documents without creating element name conflicts.

If you just set the parameter ulink.

Element ulink

In DocBook 5, the info element always comes after any separate title element and before any other content. However, such logical links may or may not be expressible in formatted output.

If your application requires xocbook to work, then be sure your stylesheets check the integrity of the associations. One of this new concept is that every element can become a link. DocBook 5 has a new system for associating annotations with elements.

In DocBook 4, a title element is permitted as a child of chapterbut also as a child of chapterinfo. For example, you can turn a command element into a link that targets the reference page for the command.

Correct such links and remove the text:. In HTML output, you can have the target document appear in a separate window if you set the ulink. There are no predefined role values. Semantically equivalent to an xref internal link. No support for entity declarations. However, in each of these other versions, certain features of the schema are lost.


The reason for this is the different datatypes. The universal linking mechanism enables you to create logical links between any two DocBook elements. It provides guidelines for conversion and describes the db4-upgrade. The problem is that URLs have no spaces, and so will not be line broken on a space.

If not, it is an validation error. Its content model is like section but without any nested sections. They are each described in more detail in the following sections. Fortunately, a guide and conversion stylesheet exist dlcbook help transition DocBook 4 documents to DocBook5. An olink-style link from any element can be formed using two attributes.

Fewer tools for validation. At the same time, the familiar DocBook linking attribute linkend has also been added anywhere an XLink can be used. The alt element lets you attach a short text description to an element. In DocBook 4, a bookinfo comes after a book’s title element, but a chapterinfo element comes before a chapter’s title element.

In DocBook 5, only a single metadata element is needed because it uses RelaxNG as the schema language. However, if you put an xlink: Either direction is sufficient to establish the association.

A namespace attribute on an element means that the namespace is in scope for that element and all of its descendants. Use the link [4] element. For example, to open a new window when clicking a link, use the xlink: This is similar to the DocBook 4 ulink element, which was removed u,ink DocBook 5. The way it works is you set the stylesheet parameter ulink. You cannot create external links with the linkend attribute.


It was never intended focbook title elements be used in both locations, because it is not clear which title should be used in the output. The linkend attribute is limited to linking to an xml: The link element has several features for creating internal or external links.

Setting the namespace as the default namespace is usually more convenient when creating an entire document in a single namespace, as is typically done with DocBook. Dovbook link element is completely empty: For example, if you put an xlink: Note, validation is only performed when using linkendnot with xlink: 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.

Linking to websites

If not, then the stylesheet will report that the module’s root element has no matching template. In DocBook 5, the alt element ulknk a similar function except that it is an element and it can be applied to many elements, not just images.

The alt element for a short text description. But it is not be used at all in PDF output, unless a customization does so.

URL link with literal text. An XML schema defines the element and attribute names, and the rules for how they are combined into documents.