The following is an example of a mediaobject set up for both HTML and FO outputs. The DocBook stylesheets can automatically select the right graphic if the. In DocBook V, three types of external objects are defined: VideoObjects, AudioObjects, and ImageObjects. Additional textual descriptions may be provided. version, , xsd:anySimpleType, Specifies the DocBook version of the element and its descendants, from group utes · xml:lang, .
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Stylesheet’s selection process
You might be wondering why the imagedata element needs an imageobject container? If so, then docbolk accepts that object and does not consider any others. Remember that the role attribute goes on meeiaobject imageobject element, not the imagedata. The original graphic element is simple, but not flexible enough to handle multiple output formats. If you want finer control, then you have the option to use any role values you want. The following attribute sets provide the spacing in the stylesheet, which you can adjust in your customization layer:.
The stylesheets contain several lists of file formats that are acceptable for each output type. If the fileref does not have an extension, it checks the graphic. The mediaobject element contains two graphical elements. If you are using XEP, then set the parameter preferred. Then you pass the selected role value in a command line parameter named preferred.
That element can be used to track information about the image, such as the software that created it, the current revision, the author, etc. The start-indent property is controlled by the attribute-set named mediaobbject.
The most frequent problems are matching graphics file formats to document output format, and sizing graphics. If you are processing with the FOP processor, then set the parameter preferred. These attributes let you indicate that the figure can float to the top, left, or right.
Although informalfigure does not take a title, they both provide additional attributes for docboook your graphics:. When you process this example with the html stylesheet, you get the PNG graphic, and when you process it with the FO stylesheet, you get the PDF graphic. Each imagedata element indicates its file name and format.
You might set doocbook role values for two different vector graphics to fo-fop and fo-xep. The automatic selection behavior is controlled by the use. If that is not desirable, then add the changes to the figure.
The stylesheet can then choose the appropriate object for a given output. You could use profiling to select from among several graphic elements, but mediaobject is designed to do it without the need for the profiling step. If its imagedata element contains a complete SVG graphic and the parameter use.
It can contain several imageobject elements with different specifications. DocBook has two main graphic elements. The DocBook stylesheets can automatically select the right graphic if the imageobject elements have a role attribute of either html or fo.
Each of these main graphic elements is supplemented with a version to mediaobhect used inline, named inlinegraphic and inlinemediaobjectrespectively. For cross referencing purposes, put the id attribute on the mediaobject container, unless you are meediaobject that inside another container such as figure.
If it is nonzero, then the role attribute is considered during the selection process. If you need to use more than one graphics file format, then you must use the mediaobject element instead of the graphic element. If its imagedata element does not contain an SVG graphic, but has a format attribute, it checks to see if its value mddiaobject on the format list for that output.
You can also use figure and informalfigure to add space above and jediaobject your graphic in print output.
The same is true for informal. With figureyou can supply a title, and your figures will be numbered and listed in the optional front-of-the-book List of Figures. Because imageobject can also contain an objectinfo element. If two objects are acceptable, only the first can ever be selected with this method. If you use example or informalexamplethen you can use the example.
Usually, the various images in a mediaobject are different formats of the same illustration, with the idea that only one of them at a time will be used by the stylesheet. But the first thing you must do is decide which elements will hold your graphics. If it does not have a format attribute, it extracts the filename extension from the fileref attribute.
This selection method is often sufficient, but is somewhat less precise than selecting by role. You can turn that behavior off if you set the parameter to zero. For example, if you have a choice of XSL-FO processors, then you could designate a graphic format optimized for each one. If all of these tests fail on the first imageobjectit repeats them on subsequent objects until it finds an acceptable one.
A mediaobject element is a container for one or more imageobject elements, each of which has an imagedata element.
It looks at the first imageobject inside the mediaobject. If you do mwdiaobject use the role attribute to select from among several imageobject elements, then the stylesheets will try to make a choice based on file format. You could also put sizing attributes there.