However, the OpenType specification (pre-1.8) does not support the use of PostScript outlines in a TrueType Collection font file. After version 1.8, both formats are suppored in the renamed "OpenType Collection". For many purposes, such as layout, it doesn't matter what the outline data format is, but for some purposes, such as rasterisation, it is significant. The OpenType standard does not specify the outline data format: rather, it accommodates any of several existing standards. Sometimes terms like "OpenType (PostScript flavor)" (= "Type 1 OpenType", "OpenType CFF") or "OpenType (TrueType flavor)" are used to indicate which outline format a particular OpenType font file contains. OpenType has several distinctive characteristics:  Compared with Apple Computer’s "GX Typography"—now called Apple Advanced Typography (AAT)—and with the SIL’s Graphite technology, OpenType is less flexible in typographic options, but superior in language-related options and support. Nevertheless, OpenType has been adopted much more widely than AAT or Graphite, despite AAT being the older technology. From a font developer's perspective, OpenType is, for many common situations, easier to develop for than AAT or Graphite. First, the simple declarative substitutions and positioning of OpenType are more readily understood than AAT's more complex state tables or the Graphite description language that resembles C syntax. Second, Adobe's strategy of licensing at no charge the source code developed for its own font development, AFDKO (Adobe Font Development Kit for OpenType), allowed third-party font editing applications such as FontLab and FontMaster to add support with relative ease. Although Adobe's text-driven coding support is not as visual as Microsoft's separate tool, VOLT (Visual OpenType Layout Tool), the integration with the tools being used to make the fonts has been well received. Another difference is that an OpenType support framework (such as Microsoft's Uniscribe) needs to provide a fair bit of knowledge about special language processing issues to handle certain languages (e.g. Arabic). With AAT or Graphite, the font developer has to encapsulate all that expertise in the font. This means that AAT and Graphite can handle any arbitrary language, but that it requires more work and expertise from the font developers. On the other hand, OpenType fonts are easier to make, but can only support complex text layout if the application or operating system knows how to handle them.