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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This is mostly unnecessary ilink it is overly verbose, difficult to read, and does not add any value. Its major advantages for use as the official DocBook schema include:.
It permits as content only text and inlinemediaobject which is only included to support characters not in the current font. The alt element lets you attach a short text description to an element.
An element’s annotations attribute accepts multiple space-separated values, so any element can be associated with more than one annotation. The only difference of the previous example is the ID cha. On the other hand, the XLink attribute xlink: Don’t forget to add the XLink namespace ullnk into the root element of your document, for example:.
It provides guidelines for conversion and describes the db4-upgrade. If your application requires annotations to work, then be sure your stylesheets check the integrity of the associations. In this case, the URI is http: You can assign a role attribute to an annotation to identify it as a certain kind of annotation.
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 docboo, namespace.
This is equivalent to the following xref notation:. The middle column shows DocBook 4 syntax, and the right columns shows DocBook 5 syntax. That adds a target attribute to the HTML anchor tag.
The following is an example of an annotation element associated with a chapter element:.
The ulink tag: Linking to a Web page
In DocBook 5, many links can be done in more than one way. These are docbbook major changes included in DocBook 5.
Internal and External Links Examples With linkend vs. The linkend attribute is limited to linking to an xml: However, if you put an xlink: If not, then the stylesheet will report that the module’s root element has no matching template.
The link element has several features for creating internal or external links. Because these attributes are in their own namespace, they do not interfere with any native attributes declared for an element. Of course, just adding a namespace declaration may not make a DocBook 4 into a valid DocBook 5 document.
You will need to develop a stylesheet customization if you want to include annotation information in your output. No support for entity declarations. If you also set the parameter ulink. Fewer tools for validation.
DocBook 5 introduces two major changes to the handling of metadata:. This is similar to the DocBook 4 ulink element, which was removed in DocBook 5. In DocBook 4, only elements that defined the document hierarchy ulikn a container element for metadata, and each hierarchical element had its own name for its metadata element.
Empty Links Using linkend This notation is semantically equivalent to an xref. The text in an alt element may docboo, appear in the output, depending on the application. DocBook 5 is the next generation of DocBook. In DocBook 4, a bookinfo comes after a book’s title element, but a chapterinfo element comes before a chapter’s title element.
Element as internal link. An annotates attribute on an annotation element matches the value of the xml: An attribute such as xlink: In DocBook 4, you can use xref 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.
These other versions contain the same element and attribute names. An annotation is associated with an element using attributes, not by placement, and the association can go in either or both directions.
The annotation element for an arbitrarily complex description. If you want to express linking from a block element, you will have to customize the docnook to do so, perhaps by putting a clickable icon in the margin.
So it can contain any number of paragraphs, lists, admonitions, etc. A namespace attribute may optionally define a namespace prefixand then the elements in that namespace must use the prefix on the element name.