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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Note, validation is only performed when using linkendnot with xlink: In other words, you do not have to use a link element anymore. You will need to develop a stylesheet customization if you want to include annotation information in your output. In DocBook 4, only a few elements like link and xref were used to form ulknk.
The link element is completely empty: 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. In DocBook 4, only elements that defined the document hierarchy had a container element for docobok, and each hierarchical element had its own name for its metadata element.
An alt element is placed as a child of the element it is describing.
Its content model is like section but without any nested sections. For FO output, you can choose whether the url attribute value for the ulink is printed. This is mostly unnecessary as it is overly verbose, difficult to read, and does not add any value.
Likewise, the annotation’s xml: An example is probably easier to understand than the explanations. The middle column shows DocBook 4 syntax, and the right columns shows DocBook 5 syntax. It is a general purpose element that can be used for a wide variety of annotation semantics. It permits as content only text and inlinemediaobject which is only included to support characters not in the current font.
RelaxNG permits an element in different contexts to have different content models. The former will generate a hyphen if the URL breaks, and the latter will not.
This is equivalent to the following xref notation:. However, such logical links may or may not be expressible in formatted output. One of this new concept is that every element can become a link. RelaxNG permits an element to have a different content model when the element appears in a different context. The reason for this is the different datatypes.
Semantically equivalent to an xref internal link. It is relatively easy to read in its compact form. Regardless of the text content, you have to choose between the attributes xlink: An element’s annotations attribute accepts multiple space-separated values, so any element can be associated with more than one annotation.
For example, book had bookinfochapter had chapterinfodoocbook.
Writing documentation with DocBook-XML 4.3
Fewer tools for validation. Empty Links Using linkend This notation is semantically equivalent to an xref. That adds a target attribute to the HTML anchor tag. It adds the following two new elements and defines the semantics of associating an annotation with an element.
The ulink tag: Linking to a Web page
A namespace attribute on an element means that the namespace is in scope for that element and all of its descendants. The universal linking mechanism enables you to create logical links between any two DocBook elements.
When a namespace attribute has no prefix, the namespace becomes the default namespace. The second ulink is empty, so the stylesheet will automatically copy its URL to use as the hot text. It is quite easy to customize in order to extend or subset the DocBook schema. Using linkend leads always to an internal link and is semantically equivalent to xref. DocBook 5 also adds new concepts.
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 uljnk file.
To make them more flexible for modular documents, the annotates and annotations attributes are declared as attribute type CDATA. There are no predefined role values.