Wave OperationsWave operations consists of a document operation, for modifying XML documents and other non document operations. Non document operations are for tasks such as adding or removing a participant to a Wavelet. We'll focus on document operations here as they are the most central to Wave.It's worth noting that an XML document in Wave can be regarded as a single document operation that can be applied to the empty document.This section will also cover how Wave operations are particularly efficient even in the face of a large number of transforms.XML Document SupportWave uses a streaming interface for document operations. This is similar to an XMLStreamWriter or a SAX handler. The document operation consists of a sequence of ordered document mutations. The mutations are applied in sequence as you traverse the document linearly. Designing document operations in this manner makes it easier to write transformation function and composition function described later.In Wave, every 16-bit Unicode code unit (as used in javascript, JSON, and Java strings), start tag or end tag in an XML document is called an item. Gaps between items are called positions. Position 0 is before the first item. A document operation can contain mutations that reference positions. For example, a "Skip" mutation specifies how many positions to skip ahead in the XML document before applying the next mutation.Wave document operations also support annotations. An annotation is some meta-data associated with an item range, i.e. a start position and an end position. This is particularly useful for describing text formatting and spelling suggestions, as it does not unecessarily complicate the underlying XML document format.
