revml.dtd #16

<!-- DTD for RevML (see <revml> version attdef for version)
     Authors: Barrie Slaymaker   <barries@slaysys.com>
              Greg Kroah-Hartman <greg@kroah.com>
              Sean McCune        <sean@sean-mccune.com>
              John Fetkovich     <fetko@slaysys.com>
-->

<!-- The order is specified for the tags so that they are in an appropriate
     order for an import utility.  Some of these constraints may be relaxed
     in the future, but in general the metadata will always precede the
     object data.  Import utilities *must* cache all necessary metadata
     regardless of order of occurence, then may discard it once the
     <content> is seen.

      To compile a DTD in to a perl module:

          vcp revml X-dtd *this*file* X-save-doctype

      where "X" is a "-" (silly XML comments).  This will write
      ./lib/RevML/Doctype/vV_VV_.pm where V_VV is the underscorified
      version #FIXED attribute from the revml ENTITY definition below.

-->

<!ELEMENT revml
    (
        time,
        rep_type,
        rep_desc,
        comment?,
	rev_root,
        branches?,
        rev*
    )
>

    <!--
      NOTE!! When changing the dtd, this version number should be
      changed also.  Any change also requires re-compiling the dtd
      with bin/compile_dtd.  For more info run 'vcp help Maintenance'
      and read the section titled 'Updating the RevML DTD.'
    -->
    <!ATTLIST   revml
        version     CDATA   #FIXED   "0.35"
    >

<!ELEMENT rep_type (#PCDATA) >
    <!-- 'p4', 'cvs', 'sourcesafe', etc. -->

<!ELEMENT rep_desc (#PCDATA|char)* >
    <!-- The version number, platform, etc. for the repository.  This
         may be needed
         so that import utilities can figure out what tags mean what
         when a particular repository version changes.

         This is often the output of 'p4 info' or 'cvs -v' + cvs
         environment settings and the cvs -l command.

    -->

<!ELEMENT rev_root (#PCDATA|char)* >
    <!-- The root of the tree that was extracted to RevML.  This
         is usually the source file spec up to (but not including) the
	 first component that does not contain a wildcard.

         This comes before branches because it's needed to modify
         branches, specifically the p4_branch_spec's View field.  That's
         a theoretical issue as implemented, but it's nice to have
         things in the safest, most mnemonic order, I think.
    -->

<!ELEMENT branch_id         (#PCDATA) >
    <!-- cvs:      <branch_id>r_1_3_b</branch_id>
         p4:       <branch_id>//depot/foo/devel</branch_id>

         The contents of this element is used to identify the branch being
         branch being exported.
    -->

<!ELEMENT p4_branch_spec (#PCDATA|char)* >
    <!-- If the source repo was p4, then all branch specs with branch ids
         used in the export are included, one per <branch> tag.  This may
         be parsed by the destination (see the subroutines
         VCP::Utils::p4->{parse,build}_p4_form()) or submitted directly
         to the destination p4 repository.

    -->


<!ELEMENT rev
    (
        name,
        source_name,
        source_filebranch_id,
        source_repo_id,
	(
	    (
                type,
                (branch_id,source_branch_id)?,
                rev_id,
                source_rev_id,
                (change_id,source_change_id)?,
                digest
            )
	    |(
                type?,
                (branch_id,source_branch_id)?,
                rev_id,
                source_rev_id,
                (change_id,source_change_id)?,
	        time,
	        mod_time?,
	        user_id?,
                label*,
	        comment?,
                previous_id,
                placeholder
            )
	    |(
                type,
	        (cvs_info|p4_info|source_safe_info|pvcs_info)?,
	        (branch_id,source_branch_id)?,
	        rev_id,
                source_rev_id,
	        (change_id,source_change_id)?,
	        time,
	        mod_time?,
	        user_id,
	        (p4_action|sourcesafe_action)?,
	        label*,
	        lock?,
	        comment?,
	        (move|(previous_id?,(content|delta),digest))
	    )
	    |(
                type?,
	        (cvs_info|p4_info|source_safe_info|pvcs_info)?,
	        (branch_id,source_branch_id)?,
	        rev_id?,
                source_rev_id?,
	        (change_id,source_change_id)?,
	        time?,
	        mod_time?,
	        user_id?,
	        (p4_action|sourcesafe_action)?,
	        label*,
	        lock?,
	        comment?,
                previous_id?,
	        delete
	    )
	)
    ) >
    <!ATTLIST rev
        id          CDATA         #REQUIRED
    >
    <!-- each <rev> must have a unique identifier, usually the name
         and revision number, though the precise format depends on
         the source repository.  The id should be derived from the
         metadata in a repeatable fashion.
    -->

    <!-- A few words about the digest, content, and delta elements:

         We could have allowed <content> or <delta> without the
	 digest, but it's safer this way and the digest is small.
	 <delta> tags should only be used for second and later <rev>s for
	 a given <name>.

	 A digest alone is only used for base revisions that should already
	 be in the target repository, for incremental updates.  If there's
	 no <delete/>, <move/> or <content>..</content> elements, it's
	 a base rev digest.

	 The first <rev> for a given name must not contain a <delta>.  It
	 should contain <content> if this is not an incremental update, or
	 just a <digest> if it is.
	 
	 The rev//digest with no <content> can only be used as the first
	 <rev> in the file for a given <name>.  it indicates that the
	 <rev_id> revision of <name> should be recovered from the target
	 repository and then checked against the <digest> field.

         <previous_id> contains the id string of the revision before this
         one.

    -->

    <!-- The reason the <delete> variant is broken out is that VSS
         does not associate much info with deletions or track them
         per revision.  So, a delete can have some info in it for
         other SCMs, but will be mostly empty for VSS.
    -->

    <!-- The second variant (optional type, no content/delta/delete) is
         for marking branch points using placeholder revs -->

    <!-- We will add repository_... tags as needed to carry along all necessary
         repository specific information without alteration.
    -->

<!ELEMENT name          (#PCDATA|char)* >
    <!-- the file name, in Unix format, relative to the repository root.
         The file/directory names '.', '..', and '' are not legal.
         cvs:       'src/iface/ftree/fi.c
         p4:        'depot/perl/perl.c', not '//depot/perl/perl.c'

         We will add vendor_... tags if this format causes loss of
         information.
    -->

<!ELEMENT type          (#PCDATA) >
    <!-- 'text' or 'binary' -->

<!-- Product specific tags.  These are used when importing data in
     to the same type of repository it was exported from.
-->

<!ELEMENT p4_info           (#PCDATA|char)* >

<!ELEMENT cvs_info          (#PCDATA|char)* >

<!ELEMENT source_safe_info  (#PCDATA|char)* >

<!ELEMENT pvcs_info         (#PCDATA|trunk_rev_id|attrib|char)* >

<!-- Repository-nuetral tags.  These must be generated by all export
     utilities, and must be used by all import utilities when importing
     from a foreign repository type.
-->

<!ELEMENT rev_id        (#PCDATA) >
    <!-- A small integer indicating the revision number of a file
         *within the branch*.

         cvs:        "3" if the cvs rev is "1.3" 
         p4:         the file revision number
         sourcesafe: the file version number
    -->

<!ELEMENT change_id     (#PCDATA) >
    <!-- Export utilities are responsible for grouping revisions together
         using a unique change_id.  change_id's are integers starting at 1
         for each file.
    -->

<!ELEMENT trunk_rev_id  (#PCDATA) >

<!ELEMENT attrib        (#PCDATA) >

<!ELEMENT lock          (time?, user_id) >

<!ELEMENT time          (#PCDATA) >
    <!-- All times are in ISO-8601 format in GMT/UCT0
         <time>2000-12-31 23:59:59Z</time>
    -->

<!ELEMENT mod_time      (#PCDATA) >
    <!-- Modification time -->
    <!-- All times are in ISO-8601 format, GMT -->

<!ELEMENT p4_action         (#PCDATA) >
<!ELEMENT sourcesafe_action (#PCDATA) >

<!ELEMENT label         (#PCDATA|char)* >

<!ELEMENT user_id       (#PCDATA|char)* >

<!ELEMENT comment       (#PCDATA|char)* >

<!ELEMENT delete EMPTY >

<!ELEMENT move (name) >
    <!-- Where the file moved to -->

<!ELEMENT delta (#PCDATA|char)* >
    <!ATTLIST delta
        type         (diff-u)       #REQUIRED
        encoding     (none|base64)  #REQUIRED
    >

<!ELEMENT previous_id (#PCDATA) >

<!ELEMENT content (#PCDATA|char)* >
    <!ATTLIST content
        encoding     (none|base64)  #REQUIRED
    >

<!ELEMENT digest      (#PCDATA) >
    <!ATTLIST digest
        type          (MD5)         #REQUIRED
        encoding      (base64)      #REQUIRED
    >

<!ELEMENT char EMPTY >
    <!ATTLIST char
        code          CDATA         #REQUIRED
    >
    <!-- char elts are used to pass on control codes that would otherwise cause
         the XML to be non-well-formed.  Each instance must have an attribute
	 code containing a hexadecimal representation of the character code
	 as string like "0x0c" (that for a ^L or form feed).
    -->


<!--
  The following source_* fields are intended to keep the corresponding
  fields without 'source_' in VCP all the way through to the
  destination unchanged for making labels and logging.
-->

<!ELEMENT source_name          (#PCDATA|char)* >

<!ELEMENT source_rev_id        (#PCDATA) >

<!ELEMENT source_change_id     (#PCDATA) >

<!ELEMENT source_branch_id     (#PCDATA) >

<!--
  These fields are similar in purpose to above, but don't have
  directly corresponding analogues without the 'source_' prefix.
-->

<!ELEMENT source_filebranch_id (#PCDATA) >

<!ELEMENT source_repo_id       (#PCDATA) >