In previous versions of XSLT, results were delivered either in serialized form (as a character or byte stream), or as a tree. In the latter case processors typically would use either their own tree representation, or a standardized tree representation such as the W3C Document Object Model (DOM) (see [DOM Level 2]), adapted to the data structures offered by the programming language in which the API is defined. To deliver a raw result, processors need to define a representation not only of XDM nodes but also of sequences, atomic values, maps and even functions. As with the return of a simple tree, this may involve a trade-off between strict fidelity to the XDM data model and usability in the particular programming language environment. It is not a requirement that an API should return results in a way that exposes every property of the XDM data model; for example there may be APIs that do not expose the precise type annotation of a returned node or atomic value, or that fail to expose the base URI or document URI of a node, or that provide no way of determining whether two nodes in the result sequence are the same node in the sense of the XPath is operator. The way in which maps and functions (and where XPath 3.1 is supported, arrays) are returned requires careful design choices. It is recommended that an API should be capable of returning any XDM value without error, and that there should be minimal loss of information if the raw results output by one transformation are subsequently used as input to another transformation.
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If a result tree is to be constructed from the raw result, then this is done by applying the rules for the process of sequence normalizationSER30 as defined in [XSLT and XQuery Serialization]. This process takes as input the serialization parameters defined in the unnamed output definition of the top-level package; though the only parameter that is actually used by this process is item-separator. In particular, sequence normalization is carried out regardless of any method attribute in the unnamed output definition.
In previous versions of this specification it was stated that when the raw result of the initial template or function is an empty sequence, a result tree should be produced if and only if the transformation generates no secondary results (that is, if it does not invoke xsl:result-document). This provision is most likely to have a noticeable effect if the transformation produces serialized results, and these results are written to persistent storage: the effect is then that a transformation producing an empty principal result will overwrite any existing content at the base output URI location if and only if the transformation produces no other output. Processor APIs offering backwards compatibility with earlier versions of XSLT must respect this behavior, but there is no requirement for new processor APIs to do so.
Note that it is not possible, using a simplified stylesheet, to request that the serialized output contains a DOCTYPE declaration. This can only be done by using a standard stylesheet module, and using the xsl:output element.
If an implementation supports the disable-output-escaping attribute of xsl:text and xsl:value-of, (see 26.2 Disabling Output Escaping), then the data model for trees constructed by the processor is augmented with a boolean value representing the value of this property. This boolean value, however, can be set only within a final result tree that is being passed to the serializer. 2ff7e9595c
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