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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Setting up the tools. It adds the following two new elements and defines the uoink of associating an annotation with an element. URL link with generated text. As such, avoid the following notation when the URL in xlink: You will need to develop a stylesheet customization if you want to include annotation information in your output.
Empty Links Using linkend This notation is semantically equivalent to an xref. The first ulink example is not empty, so its text content becomes the hot text in HTML docnook.
Chapter 4. DocBook 5 tools
Olink with literal text. For FO output, you can choose whether the url attribute value for the ulink is printed.
There are no predefined role values. In most cases, it is enough to just use an empty link element. Likewise, DocBook fragments can more easily dcbook embedded in other compound document types. Creating a link from your DocBook document to a website is easy. This allows elements from other namespaces to be mixed into DocBook documents without creating element name conflicts. Also, the id attribute in DocBook 4 is replaced with the xml: For example, you can turn a command element into a link that targets the docboo page for the command.
On the other hand, the XLink attribute xlink: The main difference is that the document’s root element must have the DocBook namespace attribute and a schema version attribute. An annotates attribute on an annotation element matches the value of the xml: The former will generate a hyphen if the URL breaks, and the latter will not.
Because the association is by attributes, an annotation element can be located close to or far from the element it is annotating. Universal linking in DocBook 5. Placing this annotation element in the chapter’s info element is simply a convenience.
If you just set the parameter ulink. DocBook 5 has a new system for associating annotations with elements. That is because the semantics of a particular annotation are defined by the application, not the DocBook schema.
DocBook 5 is the next generation of DocBook. The DocBook stylesheets currently only handle xlink: An XML schema defines the element and attribute names, and the rules for how they are combined into documents. Its major advantages for use as the official DocBook schema include:.
However, if you put an xlink: So it can contain any number of paragraphs, lists, admonitions, etc. Of ulinl, this is only useful for online formats. Note that the root element is now d: All hierarchical elements and many block elements can have a metadata container. It allows the content model of an element to be different when that element is in different contexts. The link and xref elements were retained in DocBook 5.
Correct such links and remove the text:. The element may have different content models in different contexts, to manage titled and non-titled elements, for example.
However, in each of these other versions, certain features of the schema are lost. Use the link  element.
A namespace attribute may optionally define a namespace prefixand then the elements in that namespace must use the prefix on the element name. 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. The XML parser can docbookk validate a xsd: This is similar to the DocBook 4 ulink element, which was removed in DocBook 5.
If you also set the parameter ulink.
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. Compare these two equivalent documents, one using the default namespace and the other using a prefix:.
The way it works is you set the stylesheet parameter ulink. While it is not a radical change in terms of element names and structures, it signficantly changes the foundation on which DocBook is based. Note, validation is only performed when using linkendnot with xlink: It permits as content only text and inlinemediaobject which is only included to support characters not dobook the current font.
But in DTD syntax there was no way to write a content model to prevent that combination. The following is an example of an annotation element associated with a chapter element:.
One of this new concept is that every element dochook become a link.