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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A namespace attribute may optionally define a namespace prefixand then the elements in that namespace must use the prefix on the element name.

Chapter 4. DocBook 5 tools

In DocBook 5, the alt element serves a similar function except that it is an element and uljnk can be applied to many elements, not just images. Likewise, the annotation’s xml: The following are some examples:.

There are differences in elements and content models between the two versions, so some fixup may be required.

When that parameter is not empty, then that character is inserted by the stylesheet into the printed version of the URL after every character that is included in the stylesheet parameter ulink. Note, validation is only performed when using linkendnot with xlink: An annotates attribute on an annotation element matches the value of the xml: This is similar to the DocBook 4 ulink element, which was removed in DocBook 5.


First consult DocBook V5. On the other hand, the XLink attribute xlink: DocBook 5 also has consistent placement of the info element relative to a separate title element. When a namespace attribute has no prefix, the namespace becomes the default namespace.

In DocBook 5, almost all elements can be used as the basis for docboook link. For example, book had bookinfochapter had chapterinfoetc.

Re: [docbook] ulink

All hierarchical elements and many block elements can have a metadata container. Using separate element names permitted each of them to have a different content model in the DTD, if it was needed. URL link with generated text.

It is relatively easy to read in its compact form.

Writing documentation with DocBook-XML 4.3

Of course, you can always put the title inside the info element so you do not have to remember the order at all. Internal link with docbpok text. An olink-style link from any element can be formed using two attributes. DocBook 5 introduces two major changes to the handling of metadata:.

Element ulink

Setting up the tools. As such, avoid the following notation when the URL in xlink: The XML parser can only validate a xsd: One of this new concept is that every element can become a link. That’s because almost all elements have a set of attributes that are defined in the XLink namespace, such as xlink: An attribute such as xlink: To make them more flexible for modular documents, the annotates and annotations attributes are declared as attribute type CDATA.


Likewise, DocBook fragments can more easily be embedded in other compound document types.

The middle column shows DocBook 4 syntax, and the right columns shows DocBook 5 syntax. Usually, external links are used in two ways:.

Because the association is by attributes, an annotation element can be located close to or far from the element it is annotating. In DocBook 4, you can use odcbook 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.

It permits as content only text and inlinemediaobject which is only included to support characters not in the current docbolk. The former will generate a hyphen if the URL breaks, and the latter will not. The text in an alt element may not appear in the output, depending on the application. It is allowed to use text content ulimk leave a link completely empty.

It could just as well have been placed in the book element’s info element, in an appendix element, or anywhere else in the document, and it would have the same association. An example is probably easier to understand than the explanations.

DocBook 5 also adds new concepts.