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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In most cases, it is enough to just use an empty link element. This allows elements from other namespaces to be mixed into DocBook documents without creating element name conflicts. It permits as content only text and inlinemediaobject which is only included to support characters not in the current font.
In DocBook 4, a title element is permitted as a child of chapterbut also as a child of chapterinfo. DocBook 5 is the next generation of DocBook. 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.
An annotations attribute on any element matches the value of the xml: If there is a xlink: This is equivalent to the following xref notation:. It is relatively easy to read in its compact form. You cannot create external links with the linkend attribute. URL link with generated text.
The middle column shows DocBook 4 syntax, and the right columns shows DocBook 5 syntax. Compare these two equivalent documents, one using the default namespace and the other using a prefix:.
That includes the special case of the default namespace when the attribute does not define a prefix, in which case any element that is docbooi scope and without a prefix is in that namespace.
Chapter 4. DocBook 5 tools
An annotation is associated with an element using attributes, not by placement, and the association can go in either or both directions. The problem is that URLs have no spaces, and so will not be line broken on a space. First consult DocBook V5.
Olink with generated text. Internal link with generated text. This is similar to the DocBook 4 link and xref elements.
In DocBook 5, most elements that generate some output can be made into a link. Its major advantages for use as the official DocBook schema include:. The universal linking mechanism ulinm you to create logical links between any two DocBook elements.
It has these features:.
The link element contains some text or even other elements: Use this code to create an internal link cross reference. It is a general purpose element that can be used for a wide variety of annotation semantics. The linkend attribute is limited to linking to an xml: That’s because almost all elements have a set of attributes that are defined in the XLink namespace, such as xlink: Of course, just adding a namespace declaration may not make a DocBook 4 into a valid DocBook 5 document.
However, if you put an xlink: In this case, the URI is http: Using linkend leads always to an internal link and is semantically equivalent to xref. In DocBook 4, only elements that defined the document hierarchy had a container element for metadata, and each hierarchical element had its own name doccbook its metadata element.
Writing documentation with DocBook-XML 4.3
They are each described in more detail in the following sections. For FO output, you can choose whether the url attribute value docboko the ulink is printed.
The disadvantage is that ulin, 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. Fewer tools for validation. In the following example, the prefix is d:. Correct such links and remove the text:. The text in an alt element may not appear in the output, depending dofbook the application. DocBook 5 has a new system for associating annotations with elements. RelaxNG permits an element to have a different content model when the element appears in a different context.
Setting up the tools. The annotation element for an arbitrarily complex description.
Linking to websites
Another major difference between DocBook 4 and DocBook 5 is the schema language. Semantically equivalent to an xref internal link.
But in DTD syntax there was no docbok to write a content model to prevent that combination. Its content model is like docbookk but without any nested sections. In DocBook 5, only a single metadata element is needed because it uses RelaxNG as the schema language. 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.
An olink-style link from any element can be formed using two attributes.