In order to be consistent with the XPath data model, all general and external parsed entities must be fully expanded in XML documents; they must not contain any representation of [Infoset] [unexpanded entity reference information items].

XSLT 3.0 requires a processor to support XDM 3.0 as defined in [XDM 3.0], augmented with support for maps as described in 21 Maps.

A processor may also provide a user option to support XDM 3.1 as defined in [XDM 3.1], in which case it must do so as defined in 27.7 XPath 3.1 Feature.

Note:

The essential differences between XDM 3.0 (with the extensions defined in this specification) and XDM 3.1 are that XDM 3.1 adds support for arrays, and for the xs:numeric union type.

A processor may also provide a user option to support versions of XDM later than 3.1, in which case the way it does so is implementation-defined.

The description of the Unicode Collation Algorithm in this section is technically identical to the description found in [XPath 3.1]. The description here is to be used by a processor that does not implement the XPath 3.1 Feature; if the processor does implement the XPath 3.1 Feature, the description in [XPath 3.1] applies.

The extensions to XPath 3.0 defined in this section have been incorporated into XPath 3.1. Therefore, when an XSLT 3.0 processor implements the XPath 3.1 Feature, the relevant parts of this section can be ignored.