Aliases (let the confusion begin!)

I got the SDK and XMPDumper working.  I picked an arbitrary jpg of a picture I have and dumped the XMP to a file and then went looking through it.  I bumped into this:<br /><br /> <rdf:Description rdf:about=''<br />  xmlns:pdf='http://ns.adobe.com/pdf/1.3/'><br />  &#60;!-- pdf:ModDate is aliased --><br />  &#60;!-- pdf:CreationDate is aliased --><br />  &#60;!-- pdf:Creator is aliased --><br />  &#60;!-- pdf:Author is aliased --><br /> </rdf:Description><br /><br />So I went looking through the spec for "alias" and found only this:<br /><br />NOTE: Previous versions of this specification referred to aliased properties. Specific XMP<br />implementations may treat a property in one schema as equivalent to a property in<br />another schema. However, to foster interchange, applications must always write the<br />standard, base form of the property. In this version of the specification, only the base<br />properties are listed.<br /><br />So, this caused me to go look at the pdf schema in the spec (I'm looking in "XMP Specification" January 2004) and the pdf schema documented does not mention anything about the four values that are listed above.  Sorta depressing.<br /><br />So, two questions:<br /><br />1) Can someone point me to how fields are aliased?<br /><br />2) Can someone point me to up to date documentation about Adobe's Schemas?  In particular, I'm curious about the "NativeDigest" property that are in the exif and tiff schema (at least when the XMP data is dumped by XMPDumper).<br /><br />Thanks,<br />Perry

Greetings,
From my understanding an aliased field is simply represented by a field in another schema. In this particular case, I am assuming that the pdf aliases refer to the following aliases:
pdf:ModDate -> xmp:ModifyDate
pdf:CreationDate -> xmp:CreateDate
pdf:Creator -> xmp:CreatorTool
pdf:Author -> dc:creator

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