From edba4256689c56ff69c06fe978a8a1b2a3640a6d Mon Sep 17 00:00:00 2001 From: William Victor Mote Date: Tue, 22 Apr 2003 05:03:39 +0000 Subject: [PATCH] Add
ids. Combine "foreign" discussion from the two documents. git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@196314 13f79535-47bb-0310-9956-ffa450edef68 --- .../content/xdocs/design/fotree.xml | 33 +++++++++---------- 1 file changed, 15 insertions(+), 18 deletions(-) diff --git a/src/documentation/content/xdocs/design/fotree.xml b/src/documentation/content/xdocs/design/fotree.xml index b4c94bc89..9b03bdfb2 100644 --- a/src/documentation/content/xdocs/design/fotree.xml +++ b/src/documentation/content/xdocs/design/fotree.xml @@ -10,7 +10,7 @@ -
+
Introduction

The FO Tree is an internal representation of the input XSL-FO document. The tree is created by building the elements and attributes from the SAX events. @@ -21,7 +21,7 @@ into the area tree. The complete FO tree should not be held in memory since FOP should be able to handle FO documents of any size.

The FO Tree is simply a heirarchy of java objects that represent the fo elements from xml. The traversal is done by the layout or structure process only in the flow elements.

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FONode

The base class for all objects in the tree is FONode. The base class for all FO Objects is FObj.

@@ -36,7 +36,7 @@ classes are in org.apache.fop.fo.pagination.*, for elements in the they are in org.apache.fop.fo.flow.* and some others are in org.apache.fop.fo.*.

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Making FO's

There is a class for each element in the FO set. An object is created for each element in the FO Tree. This object holds the properties for the FO @@ -53,7 +53,7 @@ element name. This maker is then used to create a new class that represents an FO element. This is then added to the FO tree as a child of the current parent.

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Properties

The XML attributes on each element are passed to the object. The objects that represent FO objects then convert the attributes into properties.

@@ -80,7 +80,7 @@ properties is Property, and all the property makers extend Property.Maker. A more complete discussion of the property architecture may be found in Properties.

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Foreign XML

FOP supports the handlingof foreign XML. The XML is converted internally into a DOM, this is then available to @@ -88,15 +88,6 @@ the FO tree to convert the DOM into another format which can be rendered. In the case of SVG the DOM needs to be created with Batik, so an element mapping is used to read all elements in the SVG namespace and pass them into the Batik DOM.

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- Extensions -

It is possible to add extensions to FOP so that you can extend the ability of -FOP with respect to render output, document specific information or extended -layout functionality.

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- Foreign XML

The base class for foreign XML is XMLObj. This class handles creating a DOM Element and the setting of attributes. It also can create a DOM Document if it is a top level element, class XMLElement. @@ -115,7 +106,7 @@ it. Other XML from an unknwon namespace will be ignored.

  • create FO Objects
    • -
    +
    Unknown Elements

    If an element is in a known namespace but the element is unknown then an Unknown object is created. This is mainly to provide information to the @@ -123,7 +114,13 @@ user. This could happen if the fo document contains an element from a different version or the element is misspelt.

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    + Extensions +

    It is possible to add extensions to FOP so that you can extend the ability of +FOP with respect to render output, document specific information or extended +layout functionality.

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    Page Masters

    The first elements in a document are the elements for the page master setup. This is usually only a small number and will be used throughout the document to create new pages. @@ -131,13 +128,13 @@ These elements are kept as a factory to create the page and appropriate regions The objects in the FO Tree that represent these elements are themselves the factory. The root element keeps these objects as a factory for the page sequences.

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    Flow

    The elements that are in the flow of the document are a set of elements that is needed for the layout process. Each element is important in the creation of areas.

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    Other Elements

    The remaining FO Objects are things like page-sequence, title and color-profile. These are handled by their parent element; i.e. the root looks after the declarations and the declarations maintains a list of colour profiles. -- 2.39.5