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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An olink-style link from any element can be formed using two attributes. In dcobook words, you do not have to use a link element anymore. In print output, long URLs that start near the end of a line may need to be broken to format nicely. If you just set the parameter ulink. These other versions contain the same element and attribute names.

docbook message

It permits as content ullnk text and inlinemediaobject which is only included to support characters not in the current font. If your application requires annotations to work, then be sure your stylesheets check the integrity of the associations. There are differences in elements and content models between the two versions, so some fixup may be required. It is relatively easy to read in its compact form.


In the following example, the prefix is d:. It is quite easy to customize in order to extend or subset the DocBook schema.

Chapter 4. DocBook 5 tools

If you also set the parameter ulink. Regardless of the text content, you have to choose between the attributes xlink: Because these attributes are in their own namespace, they do not interfere with any native attributes declared for an element.

Olink with generated text. For example, if you put an xlink: Internal and External Links Examples With linkend vs. Note, validation is only performed when using linkendnot with xlink: Another major difference between DocBook 4 and DocBook 5 is the schema language. Note the absense of the character.

Element ulink

DocBook 5 also has consistent placement of the info element relative to a separate title element. 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.

If not, it is an validation error.

For example, the DTD version does not permit an element to have different content when the element appears in different contexts. RelaxNG permits an element in different contexts to have different content models.

The link element is completely empty: It is allowed to use text content or leave a link completely empty. It could just as well have been placed in the book element’s info element, in an appendix element, or anywhere else in the document, and it would have the docook association.

  BS EN 12899-1 PDF

The only difference of the previous example is the ID cha. If there is a xlink: However, in ulinm of these other versions, certain features of the schema are lost. Olink with literal text.

Simplified DocBook DTD: Element ulink

It has these features:. Setting up the tools. No support for entity declarations. Its content model is like section but without any nested sections. It adds the following two new elements and defines the semantics of associating an annotation with an element.

Jlink second ulink is empty, so the stylesheet will automatically copy its URL to use as the hot text. All hierarchical elements and many block elements can have a metadata container.

An annotation is associated with an element using attributes, not by placement, and the association can go in either or both directions.