Our initial plans were to develop an API that is similar, if not
compatible with Microsoft Word Object Model so any solution that
utilizes Microsoft Word Automation could be easily migrated to
Aspose.Word and the learning curve for developers who a familiar with MS
Word Automation will be short. That was the original plan going back
almost 2 years ago when we started working on Aspose.Word and we were
exposing classes with interfaces that looked like the ones you would
find in the VBA object model.
Over time we became aware that implementing an API similar to
Microsoft Word Object Model is not really suitable due to a number of
reasons. One reason it was too technically difficult to implement the
Range object with its collections that are always maintained in sync.We
were also concerned that the amount of synchronization the model needs
to make to keep itself always consistent with itself could make it as
slow as MS Word Automation and we would lose one of the big advantages
Aspose.Word offers when compared to the automation approach - speed and
scalability when working on a server.
But the demand from users to expose more of the object model and allow
detailed programmatic access to document elements was high so we had to
find another model for the API. At that point in time Aspose.Word could
have been compared to an iceberg with only 10% of the classes public and
the rest several hundred classes internal and not visible to the user.
Ironically, a fully functional document object model was already there
and it was only a question of exposing it nicely to the users, but we
did not want to expose a very custom API and impose a lot of learning on
to the users.
We chose an approach that is ought to be familiar to many .NET
developers and exposed the document object model in a way similar to
XmlDocument. If you worked with classes from the System.Xml namespace
you should find many ideas, classes, methods and properties are similar
to ones found in the Aspose.Word 3.0 object model.
Document conceptually is roughly equivalent to XmlDocument, it is a
Composite consisting of a tree of document nodes.
Node and CompositeNode are somewhat similar to XmlNode and XmlElement
with the exception that the methods to work with child nodes appear only
in CompositeNode.
Node offers many methods and properties like NextSibling,
PreviousSibling, ParentNode etc similar to the methods found in XmlNode.
CompositeNode offers many methods and properties ChildNodes,
InsertBefore, InsertAfter, RemoveChild, FirstChild, LastChild etc that
are doing exactly what the corresponding methods of XmlElement are
doing.
Aspose.Word 3.0 object model defines concrete classes for all different
Word document node types such as Section, Paragraph, Run, Table, Row,
Cell etc.
There are also typed collection wrappers such as Document.Sections,
Section.HeadersFooters, Body.Paragraphs, Paragraph.Runs and so on that
provide easy and typed access to the child nodes. Such collections do
not store the nodes, but merely provide shortcut access in a type safe
manner. The child nodes are always stored in their parent node, for
example Section nodes are always stored inside a Document node.
Unlike System.Xml, Aspose.Word 3.0 does not represent attributes as
nodes. Formatting properties of nodes are exposed directly as properties
of the corresponding objects, for example Run.Font,
Paragraph.ParagraphFormat, Cell.CellFormat and so on.
XPath navigation over Aspose.Word document model is supported, see
Document.SelectNodes and Document.SelectSingleNode.
To summarize: Aspose.Word 3.0 object model represents a Word document as
an XmlDocument-like tree of document nodes and you can easily add,
remove and modify almost any node of the document.
We are working to add more documentation and diagrams about the new
object model to the Aspose.Word Programmers Guide. Happy exploring of
the new Aspose.Word API.
More info please check
http://aspose.com/Blogs/Roman.Korcha...7/23/2155.aspx


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