If your DITA XML document was created from material authored in a non-DITA environment such as FrameMaker, it might include <xref> tags automatically wrapped in <ph> elements, to allow <xref> elements in places where they would not otherwise be valid in DITA XML.
To map <ph> wrapper elements for cross references, index terms, and footnotes to output formats:
[InlineOutclassMaps]
; outputclass attribute of block or inline element = format
; For example, for the ph wrapper formats from Mif2Go:
phxref = PhXref
phindex = PhIndex
phfoot = PhFootnote
These format assignments are effective even if UseOutputClassForFormat=No (see §6.2 Specifying options for naming formats), and they override all other assignments of block and inline element formats.
For HTML output you might want to include the following settings to eliminate style tags for the wrapper elements:
[CharStyles]
; eliminate wrapper classes
PhXref =
PhIndex =
PhFootnote =