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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The ulink tag: Linking to a Web page

Of course, just adding a namespace declaration may not make a DocBook 4 into a valid DocBook 5 document. It was never intended that title elements be used in both locations, because it is not clear which title should be used in the output.

Note the absense of the character.

Instead of ulinkuse a link element with a URL in its xlink: The main difference is that the document’s root element must eocbook the DocBook namespace attribute and a schema version attribute. An annotations attribute on any element matches the value of the xml: These other versions contain the same element and attribute names.

The biggest change for DocBook 5 is that its elements are all defined in a DocBook namespace http: The linkend attribute is limited to linking to an xml: Plain text without a container element is not permitted use alt for such cases. For example, book had bookinfochapter had chapterinfoetc. It permits as content only text and inlinemediaobject which is only included to support characters not in the current font.

That is because the semantics of a particular annotation are defined by the application, not the DocBook schema. DocBook 5 introduces two ulinnk changes to the handling of metadata:. That includes the special case of the default namespace when the attribute does not define a prefix, in which case any element that is in scope and without a prefix is in that namespace.


Use this code to create an internal link cross reference. Olink with generated text. It is allowed to use text content or leave a link completely empty.

docbook message

The DocBook stylesheets currently only handle xlink: The problem is that URLs have no spaces, and so will not be line broken on a space. It is relatively easy to read in its compact form. There are differences in elements and content models between the two versions, so some fixup may be required. Note, validation is only performed when using linkendnot with xlink: To make them more flexible for modular documents, the annotates and annotations attributes are declared as attribute type CDATA.

DocBook 5 also has consistent placement of the info element relative to a separate title element. In DocBook 4, only specialized elements are used for creating links within and between documents.

The jlink column shows DocBook 4 syntax, and the right columns shows DocBook 5 syntax. This is equivalent to the following xref notation:. If not, it is an validation error. If you try to insert zero-width spaces in the ulink url attribute to allow breaks in the printed form, dicbook will find that the URL no longer works as a link.

Don’t forget to add the XLink namespace declaration into the root element of your document, for example:. However, if you put an xlink: The alt element for a short text description.

A single info element name is used as the metadata container for all elements. These attributes are in their own namespace named http: Also, the id attribute in DocBook 4 is replaced with the xml: 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. The link element is completely empty: DocBook 5 is the next generation of DocBook. You cannot create external links with the linkend attribute. Regardless docnook the parameter settings, if the URL exactly matches the ulink text string or the ulink element is empty, which produces the same resultthen the stylesheet does not repeat the same URL in brackets or a footnote.


The following example allows breaks after slash, ampersand, and question mark in a URL, and does not display a hyphen at the break:. On the other hand, the XLink attribute xlink: For example, if you put an xlink: The disadvantage is that they will not be validated by the parser, but then they will also not generate validation errors if they are not stored in the same file.

The first ulink example is not empty, so its text content becomes the hot text in HTML output. The link can go to an internal or external destination. The element may have different content models in different contexts, to manage titled and non-titled elements, for example.

An element’s docbiok attribute accepts multiple space-separated values, so any element can be associated with more than one annotation. RelaxNG permits an element to have a different content model when the element appears in a different context.

In DocBook 4, a title element is permitted as a child of chapterbut also as a child of chapterinfo. Fortunately, a guide and conversion stylesheet exist to help transition DocBook 4 documents to DocBook5. In the following example, the prefix is d:. However, in each of these other versions, certain features of the schema are lost.