Name
  pdf.GetMetaText -- get meta text from document (V1.1)
Synopsis

      t$ = pdf.GetMetaText(id, attr$)

Function
  This function can be used to get meta text from the PDF document specified by `id`. This PDF document must have been opened using pdf.OpenDocument(). The `attr$` argument specifies which text to get. This must be a string and can be set to the following values:

  `Title:`
    Document's title.
  `Author:`
    Document's author.
  `Subject:`
    Document's subject.
  `Keywords:`
    Keywords.
  `Creator`
    Document's creator.
  `Producer:`
    Document's producer.
  `CreationDate`
    Document's creation date.
  `ModDate:`
    Document's last modification date.

  Note that meta texts aren't always set. If there is no meta text for the specified attribute, an empty string is returned.

Inputs
  id
    identifier of the PDF document to use
  attr$
    string specifying the meta data to get (see above for possible values)
Results
  t$
    meta data retrieved from document

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