| • display?: is a boolean specifying whether the flow object shall be displayed rather than inlined. This characteristic is not inherited. The default value is #f. |
| • scale: is either a number or a list of two numbers or one of the symbols max or max-uniform. If it is a number, then the graphic shall be scaled by that factor in both the horizontal and vertical directions. If it is a list of two numbers, then the graphic shall be scaled by the factor specified by the first number in the horizontal direction and by the factor specified by the second number in the vertical direction. If it is the symbol max-uniform, then it shall be scaled uniformly in the horizontal and vertical directions so that its size in either the horizontal or vertical direction is as large as allowed. If it is the symbol max, then it shall be scaled in the horizontal and vertical directions so that its size in the horizontal and vertical directions is as large as allowed. This characteristic is not inherited. The default value is max-uniform. |
| • max-width: is a length-spec specifying the maximum allowed width of the resulting area when scale: is max or max-uniform. This characteristic is not inherited. |
| • max-height: is a length-spec specifying the maximum allowed height of the resulting area when scale: is max or max-uniform. This characteristic is not inherited. |
| • entity-system-id: is a string specifying the system identifier of the entity containing the external graphic or #f if the entity has no system identifier. This characteristic is not inherited and shall be specified. |
| NOTE 93 |
| The external identifier specified in an entity declaration in the source document shall be resolved into a system identifier by the entity manager of the SGML system. The resulting system identifier is available as the effective-system-id node property in the source grove. |
| • notation-system-id: is a string specifying the system identifier of the notation of the external graphic. This characteristic is not inherited and shall be specified. |
| NOTE 94 |
| The external identifier specified in a notation declaration in the source document shall be resolved into a system identifier by the entity manager of the SGML system. The resulting system identifier is available as the effective-notation-system-id node property in the source grove. The manner in which this system identifier identifies the processor for the notation is system-dependent. |
| • color: is an object of type color that specifies the color in which the flow object's marks should be made. The initial value is the default color in the Device Gray color space. |
| • layer: is an integer specifying the layer of the marks of the areas resulting from the flow object. An area shall be imaged after any area whose layer has a lower value. The initial value is 0. |
| • position-preference: is either #f or one of the symbols top or bottom. This applies if the flow object is directed into a port on a column-set-sequence flow object that is flowed into both the top-float and bottom-float zones of a column-subset and indicates whether the areas from this flow object may be flowed into only one of the zones. This characteristic is not inherited. The default value is #f. |
| • display-alignment: is one of the symbols start, center, end, inside, or outside specifying the alignment of the areas resulting from the flow object in the direction of the writing-mode. The initial value is start. This determines how the flow object expands its areas so their size is equal to the display size in the direction perpendicular to the area container's filling-direction. First space is added to the area so that its size is equal to the display size less the sum of the start and end indents: |
| • if the alignment is start, the space is all added at the end in the direction of the writing-mode; |
| • if the alignment is end, the space is all added at the start in the direction of the writing-mode; |
| • if the alignment is center, the space is added equally at the start and the end in the direction of the writing-mode; |
| • if the alignment is inside, then the flow object shall have an ancestor of class page-sequence, the direction of the writing-mode shall be perpendicular to the binding-edge: of the page-sequence, and the space shall be added on the edge that is outside with respect to the spread; |
| • if the alignment is outside, then the flow object shall have an ancestor of class page-sequence, the direction determined by the writing-mode shall be perpendicular to the binding-edge: of the page-sequence, and the space shall be added on the edge that is inside with respect to the spread. |
| • start-indent: is a length-spec specifying the indent for the edge of the area at the start in the direction of the writing-mode. The initial value is 0pt. This applies only if the flow object is displayed. |
| • end-indent: is a length-spec specifying the indent for the edge of the area at the end in the direction of the writing-mode. The initial value is 0pt. This applies only if the flow object is displayed. |
| • writing-mode: is one of the symbols left-to-right, right-to-left, or top-to-bottom. The direction determined by the writing-mode shall be perpendicular to the placement direction. The initial value is left-to-right. This applies only if the flow object is displayed. |
| • span: is a strictly positive integer specifying the number of columns that the areas resulting from this flow object shall span. This characteristic shall apply if the flow object is directed into a port on a column-set-sequence flow object that is flowed into the top-float, bottom-float, or body-text zone of a spannable column-subset. The initial value is 1. This applies only if the flow object is displayed. |
| • span-weak?: is a boolean specifying whether the areas resulting from this flow object span weakly rather than strongly. See section 12.6.5.1, Column-set-model. This characteristic applies if the flow object is directed into a port on a column-set-sequence flow object that is flowed into the top-float, bottom-float, or body-text zone of a spannable column-subset and has a span: characteristic with a value greater than 1. The initial value is #f. This applies only if the flow object is displayed. |
| • space-before: is an object of type display-space specifying space to be inserted before, in the placement direction, the areas produced by the flow object. This characteristic is not inherited. The default is for no space before to be inserted. This applies only if the flow object is displayed. |
| • space-after: is an object of type display-space specifying space to be inserted after, in the placement direction, the areas produced by the flow object. This characteristic is not inherited. The default is for no space after to be inserted. This applies only if the flow object is displayed. |
| • keep-with-previous?: is a boolean specifying whether the flow object shall be kept in the same area as the previous flow object. This characteristic is not inherited. The default value is #f. This applies only if the flow object is displayed. |
| • keep-with-next?: is a boolean specifying whether the flow object shall be kept in the same area as the next flow object. This characteristic is not inherited. The default value is #f. This applies only if the flow object is displayed. |
| • break-before: is #f or one of the symbols page, page-region, column, or column-set specifying that the flow object shall start an area of that type. This characteristic is not inherited. The default is #f. This applies only if the flow object is displayed. |
| • break-after: is #f or one of the symbols page, page-region, column, or column-set specifying that the flow object shall end an area of that type. This characteristic is not inherited. The default is #f. This applies only if the flow object is displayed. |
| • keep: is one of the following: |
| • #t meaning that the areas produced by this flow object shall be kept together within the smallest possible area. |
| • the symbol page indicating that the areas produced by the flow object shall lie within the same page; in this case, the flow object shall have an ancestor flow object of class page-sequence. |
| • the symbol column-set indicating that the areas produced by the flow object shall lie within the same column set; in this case, the flow object shall have an ancestor of class column-set-sequence. |
| • the symbol column indicating that the areas produced by the flow object shall lie within the same column set, and that the first column that each area spans in the column set shall be the same. |
| • #f indicating that this characteristic is to be ignored. |
| • may-violate-keep-before?: is a boolean which, if true, specifies that constraints imposed by the keep: characteristics of ancestor flow objects on the relative positioning of this flow object and its previous flow object may not be respected. This characteristic is not inherited. The default value is #f. This applies only if the flow object is displayed. |
| • may-violate-keep-after?: is a boolean which, if true, specifies that constraints imposed by keep: characteristics of ancestor flow objects on the relative positioning of this flow object and its next flow object may not be respected. This characteristic is not inherited. The default value is #f. This applies only if the flow object is displayed. |
| • position-point-x: is a length-spec giving the x-coordinate of the position point of the resulting area in the area's coordinate system. For this purpose, the area is considered to have a coordinate system in the same way as an area container. This shall apply only when the flow object is inlined. This characteristic is not inherited. If this characteristic is not specified and the writing-mode: characteristic is left-to-right or right-to-left, then the value shall default to 0. |
| • position-point-y: is a length-spec giving the y-coordinate of the position point of the resulting area in the area's coordinate system. For this purpose, the area is considered to have a coordinate system in the same way as an area container. This applies only when the flow object is inlined. This characteristic is not inherited. If this characteristic is not specified and the writing-mode: characteristic is top-to-bottom, then the value shall default to 0. |
| • escapement-direction: is one of the symbols top-to-bottom, left-to-right, bottom-to-top, or right-to-left specifying the escapement direction of the resulting area relative to the area's coordinate system. For this purpose, the area is considered to have a coordinate system in the same way as an area container. This applies only when the flow object is inlined. This characteristic is not inherited. If this characteristic is not specified, then its value shall default to the value of the writing-mode: characteristic. |
| • inhibit-line-breaks?: is a boolean specifying whether line breaks shall be inhibited before and after each area produced by this flow object. This applies only to line breaks introduced by the formatter to make lines fit in the available space. The initial value is #f. This applies only if the flow object is inlined. |
| • break-before-priority: is an integer that affects whether a break is allowed before this flow object. The break priority of a potential breakpoint is the maximum of the break-after-priority of the flow object immediately preceding the potential breakpoint and the break-before-priorities of the flow object immediately following the potential breakpoint, and any characters immediately following that character for which the drop-after-line-break?: characteristic is true. A break shall be allowed at a potential breakpoint only if the break priority is even. This characteristic is not inherited. The default value is 0. This applies only if the flow object is inlined. |
| • break-after-priority: is an integer that affects whether a break is allowed after this flow object as described in the specification of the break-before-priority: characteristic. This characteristic is not inherited. The default value is 0. This applies only if the flow object is inlined. |