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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Then you pass the selected role value in a command line parameter named preferred. Mediaobjec informalfigure does not take a title, they both provide additional attributes for handling your graphics:.
Stylesheet’s selection process
If its imagedata element does not contain an SVG graphic, but has a format attribute, it checks to see mwdiaobject its value is on the format list for that 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.
Because imageobject can also contain an objectinfo element. If you need to use more than one graphics file format, then you must use the mediaobject element instead of the graphic element. If two objects are acceptable, only the first can ever be selected with this method.
With figureyou can supply a title, and your figures will be numbered and listed in the optional front-of-the-book List of Figures. It can contain several imageobject elements with different specifications. If you are using XEP, then set the parameter preferred.
Each imagedata element indicates its file name and format. If you are processing with the FOP processor, then set the parameter preferred. If that is not desirable, then add the changes to the figure. Mediaobhect you process this example with the html stylesheet, you get the PNG mediaobjech, and when you process it with the FO stylesheet, you get the PDF graphic.
You can also wrap your mediaobject element inside a figure or informalfigure element. If it is nonzero, then the role attribute is considered during the selection process.
If you use example or informalexamplethen you can use the example.
This selection method is often sufficient, but is somewhat less precise than selecting by role. Remember that the role attribute goes on the imageobject element, not the imagedata. The DocBook stylesheets can automatically dobcook the right graphic if the imageobject elements have a role attribute of either html or fo. If that value is on the list of extensions for that output, then it accepts that object and does not consider any others. It looks at the first imageobject inside the mediaobject.
If it does not have a format attribute, it extracts the filename extension from the fileref attribute.
DocBook mediaobject – Complete documentation and samples
The original graphic element is simple, but not flexible enough to handle multiple output formats. You can turn docbiok behavior off if you set the parameter to zero. If all of these tests fail on the first imageobjectit repeats them on subsequent objects until it finds an acceptable one.
Other stylesheet customizations such as Website or your own will use the value for the stock stylesheet it is based upon. The automatic selection behavior is controlled by the use.
You could also put sizing attributes there. For example, if you have a choice of XSL-FO medialbject, then you could designate a graphic format optimized for each one. If your print content is styled docboik that headings are at the left margin and body text is indented, then setting this attribute to 1 lets you indicate that the figure is wide and should be positioned starting at the left margin.
The stylesheet can then choose the appropriate object for a given output. For cross referencing purposes, put the id attribute on the mediaobject container, unless you are putting that inside another container such as figure. A mediaobject element is a container for one or more imageobject elements, each of which has an imagedata element.
You can also use figure and informalfigure to add space above and below your graphic in print output. If so, then it accepts that object and does not consider any others. The preferred element for graphics is mediaobject. Graphics are a frequent cause of problems in DocBook documents.
These attributes let you indicate that the figure can float to the top, left, or right. If you want finer control, then you have the option to use any role values you want. If its imagedata element contains a complete SVG graphic and the parameter use. You might set the mediaobjecf values for two different vector graphics to fo-fop and fo-xep.
The following attribute sets provide the spacing in the stylesheet, which you can adjust in your customization layer:.
Each of these main graphic elements is supplemented with a version to be used inline, named inlinegraphic and inlinemediaobjectrespectively. DocBook has two main graphic elements. The same is true for informal. If the fileref does not have an extension, it checks the graphic. The most frequent problems are matching graphics file formats to document output format, and sizing graphics. The start-indent property is controlled by the attribute-set named pgwide.
If you do not use the role attribute to select from among several imageobject elements, then the stylesheets will try to make a choice based on file format. The mediaobject element contains two graphical elements.
You might be wondering why the imagedata element needs an imageobject container? The stylesheets contain several lists of file formats that are acceptable for each output type. But the first thing you must do is decide which elements will hold your graphics.
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.