priority tagged frames

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I hear that priority-tagged frames, i.e. frames having 0x8100 ethertype AND
valan id equal to 0, are considered untagged from the VLAN-aware bridge
perspective. however I could find exact wording on this in the standard
802.1q-2005. Could anyone help me with this and point at the
section/paragraph discussing this?

Also, am I right that a vlan-aware bridge makes a decision whether teh frame
is tagged or untagged, solely on TPID field value and doesn't take into
consideration vlan id vallue (priority tagged frames are the only exception)



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