January 13, 2019


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 ยท xml:lang, [].

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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.


Because imageobject can also contain an objectinfo element. If your print content is styled so 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 stylesheets contain several lists of file formats that are acceptable for each output type.

You might set the role values for two different vector graphics to fo-fop and fo-xep. If you are processing with the FOP processor, then set the parameter preferred.

Element mediaobject

Remember that the role attribute goes on the imageobject element, not the imagedata. For example, if you have a choice of XSL-FO processors, then you could designate a graphic format optimized for each one. If that is not desirable, then add the changes to the figure.

A mediaobject element is a container for one or more imageobject elements, each of which has an docbpok element.

If so, then it accepts that object and does not consider any others. It looks at the first imageobject inside mediaoject mediaobject. You can also wrap your mediaobject element inside a figure or informalfigure element. The preferred element for graphics is mediaobject. You could also put sizing attributes there.

These attributes let you indicate that the meviaobject can float to the top, left, or right. If the fileref does not have an extension, it checks the graphic.


Chapter Graphics

It can contain several imageobject elements with different specifications. If you are using XEP, then set the parameter preferred.

For cross referencing purposes, put the id attribute on the mediaobject container, unless you are putting that inside another container such as figure. The following attribute sets provide the spacing in the stylesheet, which you can adjust in your customization layer:. If two medialbject are acceptable, only the first can ever be selected with this method.

Graphics are a frequent cause of problems in DocBook documents. Then you pass the selected role value ddocbook a command line parameter named preferred.

The start-indent property is controlled by the attribute-set named pgwide. DocBook has two main graphic elements. If its imagedata element does not contain an SVG graphic, but has a format attribute, it checks to see if cocbook value is on the format list for that output.

If it does not have a format attribute, it extracts the filename extension from the fileref attribute. The DocBook stylesheets can automatically select the right graphic if the imageobject elements have a role attribute of either html or fo. The stylesheet can then choose the appropriate object for a given output. The original graphic element is simple, but not flexible enough mediaobjevt handle multiple output formats.

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 xocbook stylesheet. The same is true for informal. This selection method emdiaobject often sufficient, but is somewhat less precise than selecting by role.

Each imagedata element indicates its file name and format. If all of these tests fail on the first imageobjectit repeats them on mediaobkect objects until it finds an acceptable one. If you need to use more than one graphics file format, then you must use the mediaobject element instead of the graphic element.

If you want finer control, then you have the option to use any role values you want. 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 you use example or informalexamplethen you can use the example. You can turn that behavior off if you set the parameter to zero. When you process this example with mediaobjedt html stylesheet, you get the PNG graphic, and when you process it dlcbook the FO stylesheet, you get the PDF graphic.

Each of these main graphic elements is supplemented with a version to be used inline, mmediaobject inlinegraphic and inlinemediaobjectrespectively. Although informalfigure does not take a title, they both provide additional attributes for handling your graphics:. Other mediaobjectt customizations such as Website or your own will use the value for the stock stylesheet it is based upon.

The most frequent problems are matching graphics file formats to document output format, and sizing graphics. You might be wondering why the imagedata element needs an imageobject container?

That element can be used to track information about the image, such as the software that created it, the current revision, the author, etc. If that value is on the list of extensions for that output, then it accepts that object and does not consider any others. If it is nonzero, then the role attribute is considered during the selection process.

If its imagedata element contains a complete SVG graphic and the parameter use. But the first dlcbook you must do is decide which elements will hold your graphics. With figureyou can supply a title, and your figures will be numbered and listed in the optional front-of-the-book List of Figures. You can also use figure docook informalfigure to add space above and below your graphic in print output.

The automatic selection behavior is controlled by the use.