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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DocBook 5 introduces two major changes to the handling of metadata:. For example, if you put an xlink: In DocBook 4, a title element is permitted as a child of chapter docbpok, but also as a child of chapterinfo. RelaxNG permits an element in different contexts to have different content models.
Instead of ulinkuse a link element with a URL in its xlink: The main difference is that the document’s root element must have the DocBook namespace attribute and a schema version attribute. In this case, uink URI is http: Internal link with generated text. This is similar to the DocBook 4 ulink element, which was removed in DocBook 5. The universal linking mechanism enables you to create logical links between any two DocBook elements.
In other words, you do not have to use a link element anymore. For example, the DocBook 5 info element in book can contain a titlebut the info element in para cannot. That’s because almost all elements have a set of attributes that are defined in the XLink namespace, such as xlink: Links With Content Using xlink: In DocBook 5, elements from DocBook 4 such as bookinfochapterinfosectioninfoetc.
The following example allows breaks after slash, docgook, and question mark in a Dcbook, and does not display a hyphen at the break:. DocBook 5 also has consistent placement of the info element relative to a separate title element. The following are some examples:.
Re: [docbook] ulink
In the following example, the prefix is d:. The XML parser can only validate ulimk xsd: The element may have different content models in different contexts, to manage titled and non-titled elements, for example.
If you try to insert zero-width spaces in the ulink url attribute to allow breaks in the printed form, you will find that the URL no longer works as a link.
In DocBook 5, many links can be done in more than one way. An annotation is associated with an element using attributes, not by placement, and the association can go in either or both directions. An XML schema defines the element and attribute names, and the rules for how they are combined into documents.
The link can go to an internal or external destination. In DocBook 4, only specialized elements are used for creating links within and between documents. Setting the namespace as the default namespace is usually more convenient when creating an entire document in a single namespace, as is typically done with DocBook. Usually, external links are used ulin two ways:.
Use the link  element. 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. However, in each of uljnk other versions, certain features of the schema are lost.
DocBook 5 has a new system for associating annotations with elements. In most cases, it is enough to just use an empty link element.
The ulink tag: Linking to a Web page
Plain text without a container element is not permitted use alt for such cases. These other versions contain the same element and attribute names. The annotation element’s annotates attribute accepts multiple space-separated values, so any annotation can be associated with more than one annotated element. As such, avoid the following notation when the URL in xlink: But it is not be used at all in PDF output, unless a customization does so.
For FO output, you can choose whether the url attribute value for the ulink is printed.